For TX4 2.4GHz 4CH Radio System Transmitter Controller Remote Control w/ Receiver Features: 1. 2.4G technology, FHSS 67 channels frequency-hopping spread spectrum, highly resistant to anti-jamming. 2. Receiver response time is 2ms, ensuring a fast response and better control. 3. Smooth and highly sensitive to control inputs and stable at distances from 200-300m. 4. Compatible with a variety of vehicles, suitable for RC cars, RC boats and RC tanks. 5. With brake and fail safe, out of control protection function. 6. Each of the 3 channels can be set respectively, supporting mixed control of 1 and 2 channels. 7. Voltage range of the transmitter. 4.8V-6V voltage warning: 8. Voltage range of the receiver. 3.3V-6V, working current 30mA, supports high voltage servos. Specifications: Channels: 4 Mode Type: RC Car Boat Tank RF Power: Less than 20dbm Response Time:10s-12ms Control Distance: about 200-300m Voltage Input: 4.8V-6V or 1.5AAA*4 Low Voltage Warning: 4.5V Net Weight: 260G Size: 180*80*145mm Specifications of Receiver: Channels: 4 Frequency: 2.4GHz Size:16*18*12mm Package Includes: 1 * Remote control 1 * Receiver