Why product specs matter
Marketing copy is written to sell; spec sheets are written to describe. The gap between the two is where most bad purchases happen. A robot vacuum advertised as having "powerful suction" means nothing until you see the Pascal rating; a microphone sold as "studio quality" tells you nothing until you read its sample rate and self-noise figure. Specs are the part of a product that can't be spun — but only if you know what they mean.
This glossary translates the technical terms that appear in our comparison tables and product pages into plain English. Each entry explains what the spec measures, why it matters for real-world use, what range of values is good, and how it's tested. Where a spec is commonly inflated or measured inconsistently (CADR, lumens, battery runtime, suction power), we flag what to watch for so you can read a spec sheet the way a reviewer does.
Terms are grouped by category below, since the specs that matter for an air purifier are different from those that matter for an espresso machine or an office chair. Use the A–Z list at the bottom to jump straight to a term, or browse a category to learn the specs that drive that buying decision.
Portable Power Stations
7 termsAC Output (Continuous Watts)
The maximum continuous power (in Watts) a power station can deliver to AC appliances.
Measured in WattsBattery Chemistry
The specific chemical composition of the battery, impacting safety, lifespan, and performance.
Capacity (Wh)
The total amount of energy a portable power station can store, measured in Watt-hours.
Measured in WhCycle Life
The number of times a battery can be fully charged and discharged before its capacity significantly degrades.
Measured in cyclesExpandable Capacity
The ability to increase the power station's energy storage by adding external battery packs.
Peak Output (Watts)
The maximum power a power station can briefly deliver, often for starting up motors or compressors.
Measured in WattsSolar Input (Watts)
The maximum power (in Watts) a power station can accept from solar panels for recharging.
Measured in WattsHome Projectors
5 termsANSI Standard
A set of standards from the American National Standards Institute for measuring projector performance.
Brightness (ANSI Lumens)
Measures the projector's light output, indicating how bright the image appears on screen.
Measured in ANSI LumensInput Lag (Gaming)
The delay between an action on a controller/keyboard and its appearance on the projected screen.
Measured in milliseconds (ms)Native Resolution
The actual number of distinct pixels a projector can display, determining image sharpness and detail.
Measured in Pixels (e.g., "3840 x 2160")Throw Ratio
The ratio between the distance of the projector from the screen and the width of the projected image.
Sous Vide Circulators
5 termsApp Connectivity
Describes whether the circulator can be controlled via a smartphone or tablet application.
Clamp Type
Describes the mechanism used to attach the circulator securely to a cooking container.
Maximum Temperature (Fahrenheit)
The highest temperature a circulator can maintain for sous vide cooking.
Measured in °FTemperature Accuracy
How closely the circulator's actual water temperature matches its set temperature.
Measured in °FWattage
The power consumption of the circulator's heating element, measured in watts.
Measured in WattsErgonomics
6 termsArmrest Adjustability
Describes the different ways armrests can be moved to support forearms and shoulders.
Headrest Included
Indicates whether the product comes with a built-in or attachable support for the head and neck.
Height Range
The adjustable vertical span of the seat or desktop, allowing users of different heights to find a comfortable posture.
Measured in inchesLumbar Adjustability
The ability to modify the support provided to the natural curve of the lower back.
Max Weight Capacity
The maximum user weight the product is safely designed to support.
Measured in lbsTilt Mechanism
A feature allowing the chair's backrest and/or seat to recline or rock backward.
Handheld Steamers
6 termsAuto Shutoff
A safety feature that automatically turns off the steamer after a period of inactivity or when the water tank is empty.
Continuous Steam Time
The maximum duration a steamer can produce a continuous stream of steam before needing a refill or reheating.
Measured in minHeat-Up Time
The time it takes for the steamer to reach optimal steaming temperature after being turned on.
Measured in secondsSteam Output (g/min)
The rate at which the steamer produces steam, measured in grams per minute.
Measured in g/minTravel Friendly
Indicates if the steamer is designed for easy portability and use while traveling.
Water Tank Capacity
The maximum volume of water the steamer's reservoir can hold.
Measured in ml4K Webcams
6 termsAutofocus Type
Describes the technology a webcam uses to automatically adjust focus for clear images.
Field of View (FOV)
The angular extent of the scene captured by the webcam's lens, measured in degrees.
Measured in degreesHDR Support
The webcam's ability to capture a wider range of light and shadow detail, creating more balanced and vibrant images.
Low Light Correction
A feature that automatically adjusts image settings to improve video quality in poorly lit environments.
Max Frame Rate (FPS)
The maximum number of individual images (frames) a webcam can capture per second, influencing video smoothness.
Measured in fpsMicrophone Type
Describes the characteristics and capabilities of the webcam's built-in microphone for capturing audio.
Portable Pizza Ovens
6 termsBaking Stone Thickness
The depth of the pizza stone inside the oven, typically measured in millimeters.
Measured in mmCook Time per Pizza
The average time, in seconds, required to fully cook a single pizza in the oven.
Measured in secondsFuel Type
The type of energy source the pizza oven uses to generate heat for cooking.
Maximum Pizza Diameter
The largest size pizza, in inches, that can comfortably fit and cook inside the oven.
Measured in inchesMaximum Temperature (Fahrenheit)
The highest temperature the oven can reach, typically measured in degrees Fahrenheit.
Measured in °FWeight (lbs)
The total weight of the pizza oven, measured in pounds, indicating its portability.
Measured in lbsSmart Baby Monitors
7 termsBattery Life
The estimated duration a monitor's parent unit can operate on a full charge before needing to be recharged.
Measured in hoursConnection Type
Describes how the monitor transmits video and audio signals, impacting range and security.
Pan, Tilt, Zoom (PTZ)
Remotely adjust the camera's view – pan (side-to-side), tilt (up-down), and zoom (in-out).
Range
The maximum distance a baby monitor's camera can reliably transmit signals to the parent unit.
Measured in ftSleep Tracking
Advanced features that monitor and analyze your baby's sleep patterns and duration.
Subscription Required
Indicates if a paid monthly or annual subscription is needed to access certain monitor features.
Video Resolution
The clarity and detail of the video feed, measured by the number of pixels in the image.
Measured in p3D Printers
7 termsBed Leveling Type
The method used to ensure the print bed is perfectly flat and parallel to the nozzle for optimal first layers.
Build Volume
The maximum physical dimensions (length x width x height) of an object a 3D printer can create.
Measured in mmEnclosed Build Chamber
Indicates if the printer's build area is fully surrounded by walls, a roof, and a door for environmental control.
Maximum Nozzle Temperature
The highest temperature the printer's nozzle can safely reach and maintain for melting filament.
Measured in °CMaximum Print Speed
The fastest speed at which the print head can move while extruding material, measured in millimeters per second.
Measured in mm/sMulti-Color Support
The printer's ability to print objects using multiple filament colors or materials within a single print job.
Printer Type (FDM)
Defines the core technology used by the 3D printer to create objects layer by layer.
Creator Audio
8 termsBit Depth
Measures the dynamic range and resolution of digital audio, determining how accurately sound is captured.
Measured in bitFrequency Response
The range of sound frequencies a microphone can accurately capture, measured in Hertz (Hz).
Measured in HzGain Control
An adjustment that boosts the input level of a microphone's signal before it is recorded or transmitted.
Polar Pattern
The directional sensitivity of the microphone.
Sample Rate
How many audio samples are captured per second.
Measured in kHzSample Rate
The number of times per second an analog audio signal is converted into a digital sample, measured in kilohertz (kHz).
Measured in kHzXLR Connection
A professional-grade, three-pin electrical connector commonly used for microphones and audio equipment.
Zero Latency Monitoring
Allows you to hear your microphone input directly without any noticeable delay (latency) during recording.
Home Espresso Machines
7 termsBoiler Capacity
The volume of water a traditional boiler can hold and heat, measured in milliliters.
Measured in mlBoiler Type
The heating system configuration for brewing and steaming.
Heat-Up Time
The time it takes for the machine to reach its optimal brewing temperature from a cold start.
Measured in minsPID Temperature Control
An advanced electronic system that precisely monitors and maintains a stable brewing temperature.
Portafilter Size
The diameter of the filter basket holder.
Measured in mmPump Pressure
The force at which water is pushed through the coffee grounds, measured in bars.
Measured in barsWater Reservoir Capacity
The maximum volume of water the machine's removable tank can hold, measured in ounces or milliliters.
Measured in ozHigh-End Air Purifiers
4 termsCADR (Clean Air Delivery Rate) - Smoke
Measures how quickly an air purifier removes smoke particles from a room.
Measured in CFM (Cubic Feet Per Minute)Coverage Area (Square Feet)
The maximum room size an air purifier is designed to effectively clean, measured in square feet.
Measured in sq ft (square feet)Smart Sensor
An integrated sensor that detects air quality and automatically adjusts the purifier's settings.
True HEPA Filter
A high-efficiency filter standard that captures 99.97% of airborne particles 0.3 microns or larger.
Premium Rice Cookers
6 termsCapacity (Cups)
The maximum amount of uncooked rice (in US standard cups) the cooker can prepare in one cycle.
Measured in cupsFuzzy Logic
An intelligent microcomputer system that automatically adjusts cooking time and temperature for optimal results.
Induction Heating (IH)
Advanced heating technology that uses electromagnetic fields to heat the entire inner bowl directly and uniformly.
Keep Warm Duration
The maximum hours a cooker can keep cooked rice at an optimal serving temperature without quality loss.
Measured in hoursMicom (Microcomputer) Heating
A basic intelligent heating system that uses a microchip to control cooking time and temperature.
Pressure Cooking Function
Utilizes high-pressure steam to cook rice faster and enhance its texture and nutrient absorption.
Cordless Stick Vacuums
7 termsCharge Time
The duration required to fully recharge the vacuum's battery from empty, measured in hours.
Measured in hoursDustbin Capacity
The maximum volume of dirt and debris the vacuum's dustbin can hold, measured in milliliters (ml).
Measured in mlHEPA Filtration
Indicates if the vacuum uses a High-Efficiency Particulate Air (HEPA) filter.
Maximum Runtime
The longest duration the vacuum can operate on a single charge at its lowest power setting.
Measured in minutesNoise Level
The loudness of the vacuum cleaner operation, measured in decibels (dB).
Measured in dBSuction Power (Pascals)
Measures the vacuum's ability to pick up debris, expressed in Pascals (Pa).
Measured in PaSwappable Battery
Indicates if the vacuum's battery can be easily removed and replaced with a charged spare.
Portable Carpet & Upholstery Cleaners
7 termsClean Solution Tank Capacity
The volume of clean water and cleaning solution the machine can hold before needing a refill.
Measured in ozDirty Water Tank Capacity
The volume of extracted dirty water the machine can hold before needing to be emptied.
Measured in ozHeating Technology
Refers to the cleaner's ability to heat the cleaning solution, enhancing stain removal.
Hose Length
The length of the flexible hose, determining how far you can reach for cleaning tasks.
Measured in ftIncluded Tools & Attachments
Specialized nozzles and brushes designed for different cleaning tasks and surfaces.
Power Rating (Amps)
Measures the electrical current drawn by the motor, indicating its overall power and suction strength.
Measured in AmpsSelf-Cleaning Feature
An automated function that cleans the hose and internal components of the cleaner.
Smart Pet Tech
6 termsDimensions (LWH)
The physical length, width, and height of the device, measured in inches.
Measured in inchesMaximum Cat Weight
The heaviest cat the device can accommodate.
Measured in lbsMaximum Pet Weight
The heaviest weight a pet can be for the device to operate safely and effectively.
Measured in lbsSensor Type
The technology used to detect pet presence and activity.
Waste Drawer Capacity
How much waste the device can hold before needing to be emptied.
Measured in litersWiFi Enabled
Indicates if the device can connect to your home's wireless internet network for remote control and monitoring.
Robot Vacuums
4 termsHeight (inches)
The total vertical measurement of the robot vacuum from its base to its highest point, in inches.
Measured in inchesNavigation Type
The technology used for mapping and movement.
Obstacle Avoidance
The robot's ability to detect and steer clear of common household objects and hazards while cleaning.
Self-Emptying Base
A dock that automatically empties the vacuum's dustbin.