Features: KM17 computer numeric keypad, easy and fast to enter, improve work efficiency. When USB cable not used it is a calculator; when USB cable used it is a mechanical keyboard numeric keypad The backlighting automatically sleep two minutes later to enter the power-saving. Support hot-swappable, easy to replace the mechanical body and keycaps. Small size and lightweight, USB connection, suitable for a variety of computer equipment Waterproof,easy to clean; comfortable keys, quiet and no interferences. Specifications: Model:KM17 Size:about 96x143x20mm/3.78x5.63x0.79in Color: Grayish Yellow/Pink/Light Green/White Connection： USB Battery：500mAh Keys：17 Support: Waterproof And Hot Swappable Package Includes: 1PC KM17 Small Keypad note: Please allow 1-3mm error due to manual measurement.Please make sure do not mind before bid. The color may have different as the differences display,please understand.