Check the listing for details. Presentation Cicker Wireless Presenter Remote PowerPointer Clicker Laser Pointer. Color: Black, Condition: New. Listed at 10.99 USD. Description Technology: RF Frequency: 2.4GHz Battery type: one 3A battery Maximum output: less than 5mW Light-emitting distance:> 200m Working voltage: 3.7V Sleep current is less than 10uA Size: 5.5 * 0.8 * 0.8 inches Weight: 26G Receiver: Operating system: XP, Windows 7/8, Mac OS, Linux, Android USB version: USB 1.1, compatible with USB. 2.0, USB 3.0 Weight: 2.0g Package included: 1 pointer clicker for demonstration 1 wireless receiver 1 Warranty Card Notice: 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