Keychron J9 QMK Ultra-Slim Wireless Custom Mechanical Keyboard

Keychron J9 is an ultra-slim wireless custom mechanical keyboard. It supports 2.4 GHz, Bluetooth, and a wired connection. It allows anyone to master any keys or macro commands on its 75% compact layout through Keychron Launcher web app. Besides, it has included keycaps for both Windows and macOS, and users can hot-swap with low profile mechanical switch in a breeze.

SPECIFICATION
Number of Keys: 84 (75%)
Switches: Keychron Milk POM Switch
Backlight: South-facing RGB LED
Number of Multimedia Keys: 12 
Frame Material: ABS+PC frame
Keycap Material: Low-profile double-shot PBT keycaps, not shine-through
Back Plate Material: Aluminum Alloy
Layout: ANSI
Polling Rate (2.4 GHz and Wired Mode): 1000Hz
Polling Rate (BT Mode): 90Hz
N-Key Rollover (NKRO): Yes for both wireless and wired modes

*The J9 is currently compatible with Keychron low-profile mechanical switches only, as QMK does NOT support low-profile optical switches.

CONNECTIVITY AND POWER
Backlit: 22 types of RGB backlight options plus endless possibilities
Battery: 2000 mAh rechargeable li-polymer battery
Wireless Working Time (Backlit off): Up to 160 hours (Lab test result may vary by actual use)
Wireless Working Time (RGB): Up to 83 hours (Lowest brightness)
Connection: 2.4 GHz / Bluetooth / Type-C wired
Bluetooth version: 5.2
Bluetooth Device Name: Keychron J9
Compatible System: macOS/Windows/Linux

PHYSICAL UNIT
Dimension: 315.2 x 132.7 mm (12.41 x 5.23")
Weight: 606 g / 1.34 lbs
Height without keycap (front): 14.5 mm (0.57")
Height without keycap (rear): 21.44 mm (0.84")
Height incl. keycap (front): 20.3 mm (0.80")
Height incl. keycap (rear): 25.65 mm (1.01")
Typing Angle: 3º, 4.º and 7º
MCU: Low-power ARM Cortex-M3 32-bit WB32F3G71 (256KB Flash)
Operating Environment: -10 to 50℃