Features: 1.Slim Design: All keys of the wireless keyboard adopts low profiles structure, which is slim, portable and space saving. 2.Silent Ambience: This keyboard and mouse combo features high sensitivity and low noise, providing silent ambience for your work and study. 3.Adjustable DPI: This wireless mouse supports 5 adjustable DPI from 1600 to 2400, which is suitable for work, study and gaming. 4.Stable Connection: The wireless keyboard has powerful and reliable connection up to 10m which ensures stable data transmit. 5.Hot Keys: You are able to instant access your music, internet, e?mail, volume, etc by multimedia hot keys, which ensures high efficiency. specification:Item Type: Keyboard Mouse Combo Material: ABS Applicable System: Suitable for Win 95, for Win 98, for Win NT, for Win ME, for Win 2000, for Win XP, for Win Vista Working Voltage: 3V Frequency: 2.4G Channel: 16 Engine: Optics Button Life: 5 Million Times Battery: Use Two AAA Batteries for Mouse and Keyboard (Battery Not Included) PackageList:1 x Wireless Mouse 1 x Wireless Keyboard 1 x USB Receiver