This is the Hitec Spectra AFHSS 2.4GHz RF Module. FEATURES: Adaptive Frequency Hopping Spread Spectrum (AFHSS) Technology Telemetry System Smart Link All Hitec Module Type Transmitters Compatible INCLUDES: One Hitec Spectra AFHSS 2.4GHz RF Module REQUIRES: Installation on transmitter SPECS: Dimensions: 37.5mm x 59mm x 22.4mm (1.5" x 2" x 0.88") cnh 1/12/10 ir/jxs