The hot-swappable shaft is adopted to support the hot-swap of the -pin shaft and the three-pin shaft. Connection : wireless 2.4G & Bluetooth 5.0. 2.4G mode: 125hz rate of return, long battery life and energy saving solution. Bluetooth mode: Bluetooth 5.0 protocol, supports pairing and switching between two machines. Made of ABS material, durable and long service life. Product name: TESTER 68 Product code: TES68 Product arrangement: standard 68-key arrangement Connection : wireless 2.4G & Bluetooth 5.0 2.4G mode: 125hz rate of return, long battery life and energy saving solution Bluetooth mode: Bluetooth 5.0 protocol, support two-machine pairing switching Power supply mode: No. 7 battery (AAA) x 2 Positioning plate: white fuel-injected metal positioning plate + interlayer sound insulation silicone PCBA: White 1.2mm thick and rigid double-sided PCBA Axle : hot-swappable shaft Satellite axis: white positioning board satellite axis Size: 310x101x31mm Precautions : The shaft tester does not include the key cap and shaft body, and comes with a satellite shaft. The shaft tester does not support wired connection and has no USB interface. The axle tester package does not with batteries, purchase AAA batteries on your own. Bluetooth 5.0 is not compatible with WIN7, it is recommended to connect under WIN10 system. PCBA has no light master control, no light position, and does not support light modification. Colour:White Material:ABS Package Contents: 1 x Mechanical Keyboard Shaft Tester Body 1 x Chinese And English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.