This product is an official licensed product. Product is 100% Brand New (never used) and comes with original packing gift. Product is very high quality. Manufactured with paying attention for all small details. This product comes with 2.4G wireless technology. Accurate combination 1000, 1250, 1750 dpi resolution - You can easily change the dpi by simultaneously clicking the left and right buttons for 5 seconds. Than you can see the led under the scroll wheel is blinking, the speed of the blink indicates what dpi level currently is, the faster it blinks, the high dpi it is. Repeat the operation until the dpi reaches what you need. Maximum 30 meter's operation distance (no interference condition). BlueEye engine for more accuracy and saving power. With Nano receiver which can be plugged into the slot under the bottom cover Compatibility: All PCs, Macs with Windows or iOS, which have a USB port.