2.4GHz WIRELESS CONNECTION - Using advanced 2.4GHz wireless technology, plug and play, no additional drivers required. Signal transmission stability, working range up to 33ft. ERGONOMIC DESIGN - Integrated ergonomic tilt provides comfort which helps reduce strain; The great spring action and comfortable key sizes respond quickly, improving your work efficiency, great for those working on spreadsheets, accounting files or financial applications. ANTI-SLIP AND PORTABLE DESIGN - There is four non-slip mat on the back of the number keyboard, which prevents it from sliding around your desk when in use. This sturdy number pad is easy to take with you, so you can work confidently and quickly-wherever and where It is a ultrathin 19 keys of the numeric keypad which is convenient to carry office the most core stability technology. Support for windows 7/8/9110 xp /Android/for imac Product Parameter BT wireless numeric keypad 19 keys Use high-end silent silica gel keys Working distance 10m Button battery CR2032 (Not included) The ABS rosh raw material is harmless to the body Product Use: 1. First open the battery cover 2. Put the button battery model CR2032 (Not included) 3. Close the battery cover 4. Turn on the power switch 5. Open the device and search Bluetooth name: BT Keypad Specification: Battery voltage:3V lf does not use this numeric keypad for long time, please power off NOTE: If any the fluid or water infiltrate to keypad,please promptly switch off power. Color: Black Material: ABS Package Contents: 1x 2.4G Wireless Numeric Keyboard 1* Wireless Receiver