Specifications: 
Color: Black
Operation frequency: 2.4GHz RF
Operation distance: up to 10 meters
Operation voltage: 3.3V
Operation current: <300mA
Sleep current: <1mA
System requirement: Windows 2000/Windows XP/Windows Vista/Windows CE/Windows 7/ Linux(Debian-3.1 Redhat-9.0 Ubuntu-8.10 Fedora-7.0 tested), Android OS Devices (with standard USB interface)
Battery type: 2 * AAA Battery (not included)
Item size: approx. 12 * 3.7 * 2.7cm / 4.7 * 1.5 * 1.1in
Item weight: 40g / 1.41oz
Package size: 18 * 9 * 3.5cm / 7.1 * 3.5 * 1.4in 
Package weight: 75g / 2.64oz