2.4GHz FHSS4 Spread range system 4ch SSL help (ESC: Super Vortex Series etc.) integral Antenna Sanwa Super effect (SSR) support Specs: Frequency :2.4GHz FHSS4 Channel :4CH Nominal Input Voltage :3.7V~7.4V Proportions :18.2x24.4x27.1mm Bodyweight :7.1g Suitable radio: M12, Exzes Z, MT-4S, MT-4(No SSL help)