Feature:1. 2.4GHz: Wireless optical pocket pen mouse for precise and easy mouse cursor control, 2.4GHz wireless mouse, effective distance up to 10m.2. Adjustment DPI: Adjustment 800/1200/1600DPI optical sensor for smoother motion control, ergonomic design for a comfortable fit in the hand.3. Plug and Play: The 2.4G wireless pen mouse is truly plug and play, no additional drivers required, and can be used to turn pages with the scroll wheel during PPT presentations.4. Alarm Function: When the battery is low, the low voltage alarm will light up to remind you to replace the battery, not the pen mouse is bad.5. Small Portable: The 2.4GHZ USB wireless pen mouse is small in size, light in weight, does not take up too much space, and is easy to carry and use.Specification:Item Type: Wireless Optical Pocket Pen MouseMaterial: ABSProduct Size:Approx. 140 x 20 x 15mm / 5.5 x 0.8 x 0.6inConnection Method: 2.4G WirelessTransmission Distance: 10 MetersNumber of Keys: 4Optical Resolution DPI800/1200/1600Battery Type: 1 x AAA Alkaline Battery (not Included).Package List:1 x Wireless Optical Pocket Pen Mouse1 x USB Receiver1 x Micro USB Receiver1 x Type C Receiver1 x Penholder1 x User ManualNote:Ships without battery.