X4 4CH RC Radio System Transmitter and Receiver X6F 2.4ghz Remote Controller for RC Car Boat Tanks(Distance 400m-500m) Controller Transmitter

2.4G 4CH Remote Controller and Receiver:</b>DUMBORC X4 Transmitter perfect used for RC Car Boat Tank Crawler,2.4GHz Frequency and 3ms Receiver responses. Stable control your model 400-500M, good works of out of control protection <b>Low Power Alarm / 3 Power Charging Modes of Remote Controller: </b>low voltage warning: 7.4V/4.8V, It can effectively protect your battery.  Radio remote contains 3 modes for charging:1.5V AA * 4 Dry Battery, USB Power Port, and Lithium Battery Socket.