Specifications: Color: Silver Photoelectric Resolution: 1200dpi (dpi) Interface: USB Key Number: 6 (key)--Left and right buttons, pulleys (can be pressed), forward and backward keys (for browsing web pages and folders), keys to change resolution (under pulleys) Battery: AAA*2 (without battery) Wireless Transmission Distance: ≥ 10m Wireless Carrier Frequency: 2402MHz-2480MHz Wireless Working Channels: 16, automatic frequency hopping Rated Working Current: 8-15mA@3V Key Stroke: 0.8mm Press Force: 60-70 ± 10g Button Lifetime: 3 million times Size: Approx. 10 * 6 * 3.5 cm / 3.9 * 2.4 * 1.4 in Weight: 53 g Package list: 1 x Mouse 1 x USB Receiver Ergonomic Design: The wireles mouse adopts ergonomic design, this product has stylish appearance, comfortable feel. This equipment fits in your hand, so you can work or play comfortably for long hours. Accurate Positioning: Professional optical positioning technology about ergonomic mouse, this device can more accurate positioning. Compact and wireless, it can be taken anywhere you go as it fits easily in your laptop case or in a bag. Automatic Connection: The optical mouse with intelligent mini receiver, automatic connection, no tedious code matching. Simply plug the USB receiver into your computer laptop to start working in seconds. Anti-Interference Function: More than 16 million ID codes about mouse are designed to enhance the anti-interference features of the mouse. You can enjoy the same click feeling with less click noise. Adjustable Frequency: The wirless mouse with resolution 800-1600dpi adjustable frequency, enjoy your wireless free space. This equipment can meet your need when you use computers.