Features: 1. Reliable 2.4G wireless transmission: 10m open distance wireless transmission. Convenient, instant connection. 2. The standard Micro USB cable (charge + data transfer) is connected to the keyboard port and automatically enters the fast charge mode. (Note: Keep the keyboard power switch on) 3. The back is made of non-slip mats to maintain your desktop. 4. Micro USB receiver plug and play without any drivers 5. Simple storage compartment design, eliminating the trouble of receiver loss. 6. The body is made of ABS plastic, with a delicate matte texture process. Feel delicate, comfortable and durable. 7. Support for Microsoft / Android / iMac system. Specification: Model: 535 Number of keys: 19 keys Type: Wireless Keyboard Input: 3V Working distance: 10m Key life: 10 million times or more Interface: USB Plug and Play: Support Waterproof: support Button technology: crater architecture Material: ABS Charging time: 3-4 hours Standby time: 60 days Size: 15.5 * 8.8 * 2cm / 6.1 * 3.5 * 0.8in Weight: approx. 152g Package list: 1 * Keypad 1 * USB Receiver 1 * Data Cable 1 * Manual .