... but with longer usage time, endurable for up to 1 month.* One Wireless Laser Pointer, e-PointerKeyboard, mouse, presenter trinity, three-dimensional ... .Transmitting power: Max +4dBm7.Standby time: 500 - 700hours8.Working voltage: 3.3V9.Working current: < 80mA10.Charge voltage: 4.2V~5.05V11 ... ,Windows XP ,Windows Vista ,windows CE, windows 7 -Linux( Debian-3.1,Redhat-9.0 Ubuntu-8.10 Fedora-7.0 tested