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.