BOKOLI Fashion Bluetooth 3.0 Optical Mini Wireless Mouse 1000 DPI Laptop Notebook[Gray] Advanced Bluetooth technology eliminates the need for a separate receiver .Switchable DPI among 800/1000/1200/1600. Built-in software solutions with Bluetooth human interface device and comply with the standard version of the Bluetooth SIG Bluetooth 2.0. Work with Windows XP, Vista OS and Win 7/8. Sleep mode and On/Off switch for saving energy. Power Supply: 2 pieces AAA alkaline batteries (Batteries are not included). Frequency band: 2.4-2.4835GHz UNLICENSED ism Band. Receiving sensitivity: -75bm(standard). Wireless range up to 10 meters (3.3ft) Operating temperature: -10~85 degree. Workable environment: 0-55 degree. Humidity: 20%-50%. Please Order a Bluetooth Dongle first if your computer without Bluetooth Function. (Bluetooth Dongle is not included) .Size:100mmX55mmX30mm(L/W/H)