Windows Picture and Fax Viewer:Original After Drawing Line, the picture has been enlargedNoticeTo ensure that your mouse sends and receives perfectly, please read below instructions for your reference:1. Interference from iron panel of PC.①②③④ USB PortsTo get optimal performance, please plug the Nano-receiver into③、④ to avoid shielding wireless signal when placing at ①、②.2. Use USB extension wire to position the Nano-receiver at a far location to prevent electromagnetism interference from deviceswhich don’t pass safety standard.3. Avoid using the wireless mouse on a metal surface. Metals such as iron, aluminum, or copper shield the radio frequencytransmission and slow down the mouse’s response time or cause the mouse to fail temporarily.The radio frequency is 2.4GHZ, it is safe for our bodies, but please be cautious in using cardiac pacemaker or other body auxiliaryinstruments.TroubleshootingIf the mouse is not working:1. Make sure the mouse is on.2. Check battery and battery installation.3. Check receiver installation.4. Try another USB port.Product SupportNeed help with technical support? Please go to:http://www.a4tech.com/ennew/support.asp and our support team will respond within 72 hours.**Features and specifications of all A4 TECH products are subject to change without notification.SpecificationRF Data Transmit Rate 500k bps Frequency 2.407GHz ~2.473GHzModulation Type GFSK ID Codes 524,288 sets