<b> Features: </b> <br> <b>Computer Clicker Buttons Functions: </b> <br> on/off switch <br> page up (long press full screen/exit full screen) <br> page down (long press black screen/exit black screen) <br> red light <br> <br> <b>Transmitter Features: </b> <br> Frequency: 2.4GHz <br> Control Distance: more than 100m <br> Max Output: less than 5mW <br> Light Distance: more than 200m <br> Battery: 1 x AAA Battery (Not included) <br> Working Voltage: 1.5V <br> Sleep Current less 10uA <br> Dimension: 138.8*17.6*15mm <br> Weight: 18.6g <br> <br> <b>Recevier Features: </b> <br> <br> USB Version: USB 1.1, compatible with USB2.0, USB 3.0 <br> Working Voltage: 4.5-5.5V DC <br> Dimension: 24.7*13.8*5.14mm <br> Weight: 1.6g <br> <br> <b>Warranty: </b>Lifetime Service. You can get another USB chip, if you lost the original USB chip within 2 years<br> <b>Package listing: </b> <br> 1 x Wireless Presenter remote control <br> 1 x Wireless Receiver <br>1 x User Manual <br> <br> <b>Notice: </b> If you find out the up and down keys in using didn't do the work what you want it to do, please press "∧" and "∨" keys 1 second at the same time. After the indicator light flashing, you can loosen your fingers. In this way, presenter can switch to one of the three modes: 1. The Page Up and Page Down 2. The Up and Down 3. The right and left <br> <br> <br>