... out your items.3) Ready to ship out within by air, sea, EMS, TNT, DHL, UPS, FedEX, as soon as ... automatic frequency hopping requirements, effectively avoid the interference between the wireless devices 2. 2.4G wirelesstransmission can reach 10 meters ... Multiple auto dormancy function, unplug receiver or shutdown, etc, the mouse, keyboard, can get into the deep dormancyquickly ang save batteries well ...