Evo Labs BTM-001 Bluetooth Wireless Optical Mouse - Plug and Play - No Drivers Required (Bluetooth Connection Required) Pairing Instructions: Insert battery. Turn mouse on using switch on the bottom. Press and hold the Left, Right and Middle Scroll buttons for 5 seconds. Mice will then appear on your Bluetooth device list. Specifications: Model Number: BTM-001 Design: Home or Business Connection: Bluetooth Wireless Sensor: Optical Resolution: 800 DPI Number of Buttons: 4 (left, right, middle button with scroll & DPI change) Colour: Matte Black System Requirements: Windows 7, 8, 8.1, 10 Bluetooth connection 1 AA battery (Not included)