Calandis 2.4Ghz Optical Wireless Pen Mouse USB Receiver Laptop Drawing Writing Red Wireless Optical Mouse with Bluetooth  (2.4GHz Wireless, Red)

2.4ghz wireless transmission effective distance up to 8-10 meters. AVAGO 5090 photoelectric chip is linear stable and has strong surface crossing ability. The current is 14mA, and one No. 7 battery can be used for 1-3 months. It has the function of automatic no signal power off, which is more power-saving. Handwritten input, can be used on a narrow desktop. Handwritten design, comfortable to use when sitting at different angles, not tired. Humanized key position design, grasp very convenient. Mouse small base, place does not take up space.