Lightweight, durable design: Enjoy the comfort and ease you can get anywhere. Ergonomically designed, stylish and comfortable to the touch. Fits the shape of the palm: Use natural comfort grips to reduce hand fatigue. Intelligent mini-receiver, automatic connection, no need for complicated code. Plug and play, plug it into the USB port and get started Specification: Size: 97*56*33mm. Working voltage: 3V Rated work : 13m Working environment: -10 degrees to 85 degrees; Humidity: 20%-50%. Tracking system: optics. Battery:2*AA battery(not included)