Keyboard Connection: Wireless. Optical Resolution: 1200 DPI. Mouse Connection: Wireless. Type: Slim, Multimedia, Wireless Interface: USB Keys Quantity:78. With Multimedia Function Keys: Yes Keyboard Battery: 2 x AAA battery (Not Included) Mouse Battery: 2 x AAA batteries (Not Included) Keyboard Size: 285.3mm x 133m x 18mm Mouse Size: 113mm x 59mm x 20mm Material: ABS Plastic Package Includes: 1x Slim Wireless Keyboard. 1x Wireless Mini Optical Mouse 1x USB Receiver