Environmentally friendly ABS plastics; Scientific ergonomic design; A plug-and-play wireless receiver; Wireless Technology: 2.4 GHz; 1 x AAABattery Not Included Easy to use: just plug into the USB, the light on the USB is flashing light ,you already plug in the battery and press the switch on button, the USB light will become solid light and then the laser can normally light when you hold on the button, the bright red light laser pointer that's easy to see against most backgrounds, highlight key areas of your slides Wireless remote control distance range of up to 39-foot, so you can free to move around the room and interact with your audience