This is the Spectra 2.4GHz/ Optima 7-Channel Combo from Hitec. FEATURES: Adaptive Frequency Hopping Spread Spectrum Technology (AFHSS)- scans the 2.4GHz spectrum to find the cleanest channels in which to operate Converts most existing Hitec Module radios to 2.4GHz Boosted Omni Directional Antenna (BODA)- uses a single receiver antenna Smart scan mode selectable Basic telemetry function Range check mode Fail-safe/hold function Software and firmware upgradable Two year limited warranty through manufacturer beginning at date of purchase INCLUDES: One 2.4GHz Spectrum Module and Antenna Two Optima Receivers with BODA Antenna REQUIRES: Installation SPECS: Module: 59x38x20mm (2.3"x1.5"x0.79") Receiver: 57x21x11mm (2.2"x0.83"x0.43") cnh 10/12/09