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 Mouse Material: ABS Product Size:Approx. 140 x 20 x 15mm / 5.5 x 0.8 x 0.6in Connection Method: 2.4G Wireless Transmission Distance: 10 Meters Number of Keys: 4 Optical Resolution DPI：800/1200/1600 Battery 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 Manual Note: Ships without battery.