This mouse has an intelligent power saving mode, which can last for a long time without frequent battery replacement. The installation is simple, just install the battery, turn on the switch, and then plug the USB receiver into the device to use. Adopt 2.4GHz wireless technology and optical engine, which is very durable. It is small and light, which is more convenient to carry and is a good choice for business trips. Easily applicable to a variety of occasions, whether it is the desktop of the cafe or the bed, it can provide a consistent and stable experience. It adopts a symmetrical scientific design that fits the hand better, caters to various hand types, adapts to different grip postures, and makes the operation easier to use. Item Name: Mouse Material: ABS Optical Resolution: 1000DPI Wireless Transmission Frequency: 2.4GHz Operating Distance: 10m Number of Keys: 3 Keys Battery: 1 x AA Battery(Not Included) Features: Power Saving Mode, Easy to Install, Portable, Durable Size: 9.8cm x 5.6cm x 3.4cm/3.86" x 2.20" x 1.34" (Approx.) Notes: Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Mouse