Item Type: USB Wired Numeric Keypad Material: ABS Interface Type: USB Number of Keys: 19 Connection Method: Wired Light Color: Blue, Purple, Red Applicable Equipment: Suitable for laptops, computers, etc. Applicable System: Support for Microsoft, for Android, for OS X 1、Plug and Play: The wired numeric keypad is powered by USB interface, no external power supply required, no need for additional drivers, can be used by plugging in the computer with stable connection.  2、Ergonomic Numpad: The numpad has 19 keys, each key is ultra sensitive and ergonomically designed to provide you with more comfortable angle of inclination and help reduce pressure on your wrist.  3、High Compatibility: The premium mini USB wired numeric keypad works with various types of laptops and computers. Support for Microsoft, for Android, for OS X system.  4、Compact and Portable: The numeric keypad is portable and light weight, ideal for business trips or daily use, better choice for processing spreadsheets, accounting documents, or financial applications.  5、Exquisite Workmanship: The wired mechanical numeric keypad with classic black appearance as well as blue, purple and red RGB backlights, lower working noise and comfortable pressing feeling, not easy to fall off.