Features: Exquisite technology: carry with 2.4G spectrum spread technology as well as FHSS 67 channels frequency-hopping spread spectrum, highly resistant of anti-jamming to ensure highly sensitive transmission Highly sensitive transmission: quick response for time around 2ms to offer a better control inputs and stable at distances from 200-300m. Speciality design: supporting mixed control of channel 1 & channel 2, special brake and fail safe design with out of control for protection function. Each of the 3 channels can be setup separately. Voltage ranges: voltage range of the transmitter is around 4.8V-6V , voltage range of the receiver is around 3.3V-6V, working current is 30mA which also supports high voltage serve. Various compatible: suitable for RC for cars, RC boats and RC tanks and for variety of RC toys. Specifications: Specifications of Transmitter: Channels: 4 Mode Type: RC Car Boat for Tank RF Power: 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 Net Weight: 260G Size: 180 x 80 x 145mm/7.08 x 3.15 x 5.71 inch Specifications of Receiver: Channels: 4 Frequency: 2.4GHz Size:16 x 18 x 12mm/ 0.63 x 0.71 x 0.47 inch Package Includes: 1Set GA-4H-TX 2.4GHz RC Transmitter/1Set GA-4H-TX 2.4GHz RC Receiver note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.