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===Special Key Setting=====Special Key Setting=====Using Earphone=====Using Earphone====Technical Specifications==License free country: Europe/Hongkong/USA for your optionChannels available: 8/20/22 channels for your opdonOpening frequency: 446/409/462 MHz 0Powct: 3.7V lithium batteryOutput power: 0.5W minumService life of cells: On the basis of servicesReceiving range: up to 7km (in open space but no guarantee)USB charging: ~ 5V DCTX power current: ~ 300 mARX power current: ~ 100 mAStantby cunem: ~ 50 mATime mode current: ~ SmA