Instructions for use 1. Hold the front part of the product with your left hand, and pull the battery cover with your right hand to remove the battery cover 2. Insert an AAA alkaline battery according to the correctness, and turn on the switch of the product. 3. Take out the micro USB receiver from the battery compartment and insert it into the USB port of the computer. The pen mouse and the receiver have been paired before leaving the factory, so plug the receiver into the USB socket of the computer to automatically connect it. 4. It can slide on the mouse pad, desktop, etc. like a pen to move the cursor. It can be used in business meetings, PPT presentations at work, speeches, teaching and many other occasions. Pick up the pen with your hand and use the scroll wheel on it to make PPT, pictures and other presentations. specification: Product size: 140*20*15mm Product weight: 29g Number of buttons: 4 Wireless carrier frequency: 2402 MHz-2480 MHz Wireless working channels: 16, automatic frequency hopping Rated working voltage: 3V Rated working current: 15 mA Tracking system: optical Speed: 14 inches/sec Packing: 1*writing pen mouse