Keychron B1 Pro Ultra-Slim

The B1 Pro is Keychron's first ultra-slim scissor-switch board, closer to a laptop keyboard than a mechanical one. Keychron's page lists a 75% layout with 77 keys, ABS keycaps, an 800 mAh battery, 2.4GHz, Bluetooth 5.2 and wired USB-C, and support for ZMK. It weighs 425 g by Keychron's figure and has no backlight. WIRED reviewed it alongside the B6 Pro: it compared the B6 Pro's scissor keys with Logitech's MX Keys S (springy, a touch more resistive) and described the B1 Pro as similar in a more compact form, adding that the three-device switching is more useful on a board small enough to travel. Tom's Guide found it satisfying to type on but disliked the cheap-looking cable and dongle, and noted it does not work with Android. How-To Geek praised the comfortable 3.2 degree angle and rubber feet and said the plastic frame resembles modern Apple laptops. Keychron's page rates the battery at up to 1,200 hours (about 8 months at 5 hours a day) from the 800 mAh cell. Tom's Guide and WIRED both repeated that rating without draining it, so treat it as Keychron's estimate; the lack of a backlight is part of why it is so high. Tom's Guide also says the board did not connect to Android devices, although Keychron's page lists Android as compatible.