Perman Mini Bluetooth 3.0 1000 DPI Wireless Optical Mouse Mice for Computer PC Laptop Notebook Black Advanced Bluetooth technology eliminates the need for a separate receiver. Size:100mmX55mmX30mm(L/W/H). Switchable DPI among 800/1000/1200/1600. Please Order a Bluetooth Dongle firstly if your computer without Bluetooth Function. (Bluetooth Dongle is not included) Frequency band: 2.4-2.4835GHz UNLICENSED ism Band. Power Supply: 2 pieces AAA alkaline batteries (Batteries are not included) 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.