LP171B General Specs Model 920 Color of Laser red Technology RF 2.4GHZ Receiver Type integrated USB receiver Supported PC System  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 Battery  1*CR2302 battery (included) Install driver or not no 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: 129.47 g Size: 15.8*8.8*2.6 cm Package Includes 1 × Red Laser Pointer 1 × USB Receiver 1 × CR2032 Battery