Liam McCabe

An OLED TV lights each pixel on its own for perfect black, while QLED and LED TVs are LCDs lit by a backlight; QLED adds a quantum dot layer for purer color.

A prepaid SIM lets you pay for phone service first, with no contract, and an eSIM does the same job but is built into the phone and set up in software.

Red switches are linear and light, brown switches have a soft bump, and blue switches add a click; the color names come from Cherry MX, and others follow.

Oscillating brushes turn a small round head back and forth, sonic brushes vibrate an oval head side to side; sonic is the most common motion we list.

Upright, canister, stick, handheld, robot and wet-dry vacuums suit different homes; air watts measure suction, and cordless trades runtime for reach.

Top-load coolers are simple and cheap, bottom-load coolers spare you the lift, and point-of-use units plumb in; hot water tanks drive most power use.

Wine coolers are sized by bottle count and width, a dual zone model holds two temperatures, and a compressor cools lower than a thermoelectric unit.

A laptop's screen size is the diagonal of the display in inches; 16 and 15.6 inches are the two most common sizes among the laptops we list.

Robot vacuum suction is a maker's pressure figure in pascals; about half of the robot vacuums we list state one, most often 15,000 to 29,999 Pa.

The Wi-Fi number names the standard's generation; Wi-Fi 6E and Wi-Fi 7 add the 6 GHz band, and Wi-Fi 7 is the most common among routers we list.