No action within 8 minutes, it will turn to sleep mode.When receiver is not plugged or computer is off, it will turn to off mode.The USB receiver is plug and play, easy to operate.Item Name: Wireless MouseMaterial: ABSRadio-frequency Carrier: 2402-2480MHzRF Operation Channel: 16, Auto Frequency HoppingUSB: USB 2.0Operation Systems: for Windows 2000/Me/XP/Vista/Win 7Battery: 2 x AAA Battery (Not Included)Rated Working Current: 15mA, 1.5VFeatures: Ergonomic, Wireless, PortableSize: 10cm x 6cm x 3cm/3.94" x 2.36" x 1.18" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Wireless Mouse (Battery Not Included)1 x USB Receiver