Brand: N/AModel: JW-1979  Material: Plastic  Quantity: 1 Piece  Interface: Others，No  Wireless or Wired: 2.4G Wireless  Bluetooth Version: No  Compatible Brand: Others，Universal  Tracking Method: Touch Pad  Back-lit: No  Operation Distance: 10 m  Anti-ghosting Key: 105  Powered By: AAA Battery  Battery included or not: Yes  Charging Time: N/A Hour  Battery Number: 2 x AAA Batteries， included.  Waterproof: No  Type: Ergonomic  Supports System: Others，Windows 2000/2003/Vista 7  Other Features:   Remote control battery: 2 x AAA batteries， included.  Packing List:  1 x Wireless Keyboard  1 x Wireless Mouse  1 x USB Receiver  4 x AAA Batteries<img src="http://112.74.112.28/down/products/20000475/20000475_000.JPG">