1.[Convenient]Wireless asynchronous, no switching, can be used simultaneously with the large keyboard without . 2. [ and stylish]compact and convenient, convenient to store and save space, suitable for business travel. 3.[Simple setup]it's easy to get started, just plug the receiver into a USB port and start crunching numbers right away. No drivers required. Keys are easy and silent to , greatly your productivity! 4. [Waterproof design] Ultra-thin chocolate buttons are used, which are soft and comfortable to . 5.[Compatibility]Works with PC and desktop computers that have 2000/ XP/ Vista/ 7/ 8/ 10 operating systems, Bluetooth wireless chocolate numeric keypad Bluetooth version: 3.0 : more than 10 million times Battery: 1.5 V Weight: 102g Support system: three systems IOS, ANDROID, size:140x85x10mm Material:ABS colour:Black Package Contents: 1 x keyboard 1 x English manual Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.