... radio Full-duplex, clear sound CE/FCC/ROHS passed 500m stable talking,power saving AFH technology,anti-jamming Instruction : Power ON ... standby mode. Low Battery : Power light twinkle if is low voltage when machine is in standby mode, please replace battery. Call ... lithium battery 2000mA/h 3.7V, Charge limit voltage of 5V. Charger: Input AC voltage 110V ~ 240V, 50/60Hz , Output 5V/1A , pass ...