Features: The built-in high-quality lithium battery, which can be charged and discharged hundreds of times,and without changing the battery. Designed to be utilized in neutral "handshake" wrist and arm positions for smoother movement and less overall strain helping alleviate wrist pain. Switch between DPI levels 1200 , 1600 and 2400 to adjust mouse responsiveness depending on your need and/or preference. Optical Tracking Technology ensures greater sensitivity for precise tracking on a wide range of surfaces. Use the back/forward buttons located near the thumb area for optimum convenience. Suitable for notebook ,laptop tablet, Desktop PC. Specifications: Material: ABS Colour: Black Dimensions: approx.153x100x86mm/ 6.02x3.94x3.39in Wireless Transmission Frequency: 2.4GHz Number of Keys: 7 (keys) DPI: 1200/1600/2400 Package Includes: 1x Wireless Mouse 1x Charging Cable 1x 2.4GHz Receiver 1x Manual note: Due to the lighting effects and shooting angles, there is color difference in the product, please understand. Due to manual measurement, there is a tolerance in the product size.