Features: brand new and high quality Exquisite Technology: With 2.4G spectrum spread technology as well as frequency-hopping spread spectrum, highly resistant of anti-jamming to ensure highly sensitive transmission. Highly Sensitive Transmission: Quick response for time to offer a better control inputs and stable at distances output. Speciality Design: Special brake and fail safe design with out of control for protection function. Upgrade Function: Upgrade from manual to automatic function, the 7.0 version main board supporting automatic frequency matching with more sensitive receiving. Various Compatible: suitable for RC Tanks, and for variety of RC toys. Specifications: Type A: Specifications of Main Board: Frequency: 2.4GHz Size:16 x 18 x 12mm/ 0.63 x 0.71 x 0.47 inch Net Weight: 54g/0.12 lbs Type B: Specifications of Transmitter: Mode Type: 2.4GHz Henglong RC for Tank Transmitter Net Weight: 264g/0.58 lbs Packing Size: 235 x 190 x 90mm/9.25 x 7.48 x 3.54 inch 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. Package includes: 1x TK-7.0 Main Board or 1x 2.4GHz RC Transmitter(optional)