30 days money-back and 12-months guaranty, when you are not satisfied with our product or you have any question, please contact with us to get a after-sale service, we will give you a satisfied response within 24 hour. Sensitive and Noiseless Quiet clicks free your worry about bothering other beside you and keep you focused while working or studying. The optical laser allows for quick response, precise movement and smoother tracking 3 Adjustable DPI 800/1200/1600 DPI Resolution Optical Tracking Technology provides more sensitivity than standard optical mice for smooth and precise tracking on a wide range of surfaces,suit both ordinary and gaming needs Built-In Battery Easy to charge by micro usb cable,save you the cost of buying batteries Comfortable Design Perfect for All Hands,fits comfortably in your hand and the buttons are perfectly located for your office and gaming needs, avoids hand fatigue for long term use Specification： Bluetooth Technology: Bluetooth 3.0 Item Dimension：4.29*2.75*1.45inches Item Material: ABS Number of the Key: 6 Buttons Net Weight: 3.2 oz DPI: 800-1200-1600 Power Supply: Built in rechargeable battery How to connect: 1. Turn on the mouse switch 2. Turn on your device's Bluetooth, and let it search for Bluetooth devices around 3. Click the Bluetooth pairing key on the mouse quickly 4. Wait a while, when your device searches for a device called a Bluetooth mouse, click Match Package included: 1 x Bluetooth Mouse 1 x User Manual 1 x Charging cable Please Note: A Bluetooth USB adapter is needed if computer doesn't support Bluetooth function. The Back and Forward Buttons are not available for Mac OS. Don't support iPad bluetooth connection. (for iPad all series).