2.4G technology, FHSS 67 channels frequency-hopping spread spectrum, highly resistant to anti-jamming. Receiver response time is 2ms, ensuring a fast response and better control. Smooth and highly sensitive to control inputs and stable at distances from 200-300m. with a variety of vehicles, suitable for RC , RC boats and RC tanks. With brake and fail safe, out of control protection function. Each of the 3 channels can be set respectively, supporting mixed control of 1 and 2 channels. Voltage range of the transmitter. 4.8V-6V voltage warning: Voltage range of the receiver. 3.3V-6V, working current 30mA, supports high voltage servos. Specifications of Transmitter: Channels: 4 Mode Type: RC Car Boat Tank RF : Less than 20dbm Response Time:10s-12ms Control Distance: about 200-300m Voltage Input: 4.8V-6Vor 1.5AAA*4 Low Voltage Warning: 4.5V Specifications of Receiver: Channels: 4 Frequency: 2.4GHz Colour: black Material: plastic Package Contents: 1 * Transmitter 1 * Receiver Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.