The 3 cs of ronans portable optical mouse design: comfortable, contoured and cordless make web navigation effortless. With 2.4ghz wireless technology, the t142 can reliably be operated at a working distance up to 6 meters. Simply connect the usb nano receiver (included) into an available usb port on your laptop or computer, power on the t142 and click away (no extra software pairing required). For high precision projects or high-speed gaming experience, the t142 has got you covered easily adjust the cursor sensitivity to 800 or 1600dpi by pressing the dpi button located near the scroll wheel. The t142 is ideal for laser touch branding and makes a perfect companion to the ronan t143 wireless charger mousepad. (note: one non-recycled non-rechargeable alkaline aa battery is included in the t142)