LP445W General Specs Model 920 Laser Color red Technology RF 2.4GHZ PC System Support Window 98/Se/me/2000/XP/Vista/Linux/Mac Page-turning Support yes Power 5mw Irradiated Range 10m Wavelength 650nm Transmitter Voltage 3V Receiver Voltage 4.5-5.5V Power Supply 1 × CR2302 battery (included) Features Supports page control function: page up or page down. Supports keyboard hotkey function. You do not need to make unneccessary trips back and forth to the PC/Laptop or require a personal assisstance. Frees yourself from the inconvenience of using the mouse to navigate slides. Remote control range over 10 meters. Works on any computer with USB port. Comes with an integrated USB receiver for use. Package Details Weight: 113.42 g Size: 15.8*9*2.7 cm Package Includes 1 × Red Laser Pointer 1 × USB Receiver 1 × CR2032 Battery