H23 【Multi-function Wireless Keypad】Bluetooth keypad expands the existing keyboard, adding a full 22-key keypad that supports NumLock, ESC, Tab, Delete, etc. With shortcut keys to directly open the computer calculator, it is ideal for data entry and Excel spreadsheets. The versatile 22-key Bluetooth wireless external keypad is unique compared to other keyboards. 【Bluetooth Wireless Connection】Bluetooth technology provides cable-free & clutter-free connection with a 10m operating distance, is very stable and reliable, requires no device drivers, has no delay or dropout, and achieves fast data transfer. [Note: There is no USB receiver. For desktop notebooks without Bluetooth functionality, you must use a third-party Bluetooth adapter (not included) before use]. 【Power Saving Design】Powered by 1*AAA battery (sold separately). The wireless Bluetooth keypad automatically enters sleep mode after a few minutes of inactivity. While in use, press any key and wait a few seconds for the keypad to return to working mode. The indicator lamp will flash when the power is low. 【Ease of Use】Comfortable typing with precise control, good elasticity, quick response, reduced key press noise, and quiet office operation and long life. The ergonomic tilt provides optimal comfort and can reduce wrist strain. The fixed angle and four non-slip pads firmly secure it to the desk, reducing the burden of long typing sessions. 【Compatible Systems】The Bluetooth wireless keypad works with PCs, laptops, and desktop computers equipped with Windows 2000/XP/Vista/7/8/10, Mac OS X 10.6 or later, and Linux 2.4 or later OS. The Bluetooth keypad is not fully compatible with Mac OS. (Mac OS systems may not be fully compatible. For example, number keys work normally, but function keys may not work normally.)