Description: USB interface, without any driver.and it can be used by plugging the receiver into the USB port. 2.4G wireless transmission technology, 10 meters open wireless transmission, freedom and timely, and the connection is not interrupted. Built-in lithium battery, energy saving and power saving.It can be fully charged in 3-4 hours, and the standby time is 60 days. Made of ABS plastic material, with matte texture processing, it feels delicate and comfortable, durable and more wear-resistant. Small size, easy to carry, can be placed in a small bag at any time, convenient for your travel and office. Specification: Material: ABS material Keys: 19 keys Interface: USB interface receiver, effective distance 10 meters Battery: Built - in rechargeable battery, advanced technology, automatic sleep Key life: more than 10 million times Product Input: 3.3V Support systems: for Android, Microsoft, Apple Size Chart: 6.10 x 3.46x 0.79 inch Package Includes: 1 Piece Wireless numeric keypad 1 Piece Receiver 1 Piece Package Box 1 Piece Charging Cable 1 Piece manual