Ⅰ. Stable connection: 2.4GHz wireless technology, plug and play, no device driver needed, stable signal transmission, no delay numeric keypad. Ⅱ. Compatibility: Compatible with Android tablet numeric keypad, Linux, Chromebook, Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 series. Ⅲ. Professional design: Full-size 18-key keyboard. Professional design, suitable for laptops, banks, schools, enterprises, etc. The service life of the numeric keypad keycap is more than 10 million times. Ⅳ. Ergonomic design: ABS material, compact and slim design, the numeric keypad is easy to carry, the 18-key numeric keypad is easy to press and quiet, ergonomic tilt and non-slip. The pad at the back provides optimal comfort. Ⅴ. Energy-saving technology: Energy-saving technology, longer service life, no need to worry about the battery of the laptop numeric keypad. Ⅵ. Item Type: Numeric Keypad Ⅶ. Material: ABS Ⅷ. Key Life: More than 10 million times Ⅸ. Type: 2.4GHz Ⅹ. Key: 18 keys Ⅺ. Product Size: Approx. 140 x 86 x 20 mm / 5.5 x 3.4 x 0.8 inch Ⅻ. Battery: 1 x AAA battery (excluding) ⅩⅢ. Interface: USB ⅩⅣ. 1 x numeric keypad ⅩⅤ. 1 x USB receiver