Keychron J4 TKL layout wireless mechanical keyboard with linear red switches, open-source customizable via QMK firmware. Features Bluetooth 5.1 and 2.4 GHz wireless connectivity for up to 3 devices, 1000 Hz polling rate, RGB backlight with 22+ lighting effects, and up to 3–4 weeks battery life with backlight off. Includes USB-C cable, 2.4 GHz USB dongle, and keycap puller. Keycaps are cream/beige with red accent keys (Esc, Enter, Space bar) on a dark navy/charcoal base. Condition: item appears unused and as-new; box has been opened.
