Hrph Updated Version Bluetooth 3.0 Wireless Mouse 800/1200/1600 DPI + Bluetooth EDR Dongle Wireless Adapter USB 2.0 for PC Wireless Mouse Its lightweight, slim design makes it perfectly for travel, and the lack of a cable or USB receiver to lose removes the risk of leaving your mouse nonfunctional. The Updated version make easy Installation--One-click connection. Instructions: 1. Install with 2 AAA batteries and turn the mouse on.