Feature: 1. 2.4G frequency, stable signal. Only use FHSS frequency hopping algorithm, multiple people can operate in the same place at the same time without interference. The ground remote control distance is stable 400 meters. 2. Can be set to runaway protection, 1-2CH can be set to mix control mode, fine-tuning button can be set to lock. 3. Fine craftsmanship. Standard sponge wheel, exquisite electroplating of the hand wheel, high-grade PVC panel, every detail is finely processed. 4. Ergonomics, comfortable hand feel, not easy to sweat. 5. Large battery compartment, innovative detachable battery box, can be directly inserted into the 2S lithium battery balance port, convenient and practical. Specification: Features: 2.4G frequency, stable signal. Only use FHSS frequency hopping algorithm, multiple people can operate in the same place at the same time without interference. The ground remote control distance is stable 400 meters. Can be set to runaway protection, 1-2CH can be set to mix control mode, fine-tuning button can be set to lock. Fine craftsmanship. Standard sponge wheel, exquisite electroplating of the hand wheel, high-grade PVC panel, every detail is finely processed. Ergonomics, comfortable hand feel, not easy to sweat. Large battery compartment, innovative detachable battery box, can be directly inserted into the 2S lithium battery balance port, convenient and practical. Specification: Item Name: CT-400 Transmitter Model Type: Car/Boat/Tank Channels: 4CH RF Range: 2.4Ghz ISM(2.4005-2.483.5GHz) RF Power: <100mW Modulation: GFSK Spread Spectrum: FHSS Reaction Speed: PWM:≤20ms RF Distance: Ground 400M Receive Sensitivity: <-97dbm Transmitter Voltage: DC 4. 5V-9V Battery: need 4*AA battery(not included) Size: 21.3 * 11.7 * 11.5cm Package Information: Package Size: 26.5*20.5*14cm Package Weight: 409g Gift Box Packaging Packing List: 1* Remote Controller 1* Receiver Package List: 1* Remote Controller 1* Receiver