Brand: Rii - Model: R900 - Color: Black - Ergonomic design stylish and classic appearance - Scroll wheel function it is easy to operate - 2.4GHz wireless connection more than 10m operating distance - Built-in red laser pointer suitable for multimedia teaching meeting lecture and other activities - Powered by 2 x AAA batteries - Working voltage: 3.3V - Working current: <30mA - Charging current: <300mA - Sleep current: <1mA - Supports Windows 2000 / XP / Vista / CE / 7 / Linux - Packing List: - 1 x Laser pointer - 1 x 2.4GHz receiver - 2 x AAA batteries - 1 x English manual