2.4GHz FHSS4 Spread Spectrum System 4CH Telemetry-Compatible SSL-Compatible (SUPER VORTEX ESC etc.) Super impact (SSR) Mode Compatible Lightest fat in identical program receivers Specs: Frequency : 2.4GHz FHSS4 Channel : 4CH Nominal Input Voltage : 3.7-7.4V Dimensions : 30.0x23.3x14.0mm Bodyweight : 6.6g Appropriate radio :M12S, M12, EXZES ZZ, EXZES Z, MT-4S, MT-4(non-Compatible with SSL), MT-S