... powful cost low, good quality and b 2.4G wireless optical MouseFirst ,the product descriptionThe 2.4G cordless products, transmission range ... batteries can be used approximately 10 days Third , Specifications Parameter1. Supply Voltage 1.5V, using a AA battery-powered2. The normal ... when, DPI LED flashes once every three seconds. If the supply voltage is greater than 1.1V, DPI LED extinguished.Dongle ...