This is the Optima 7 7ch 2.4GhZ Receiver from Hitec. FEATURES: Dual LED status indicator with low battery warning SPC (Supplemental Power Connection) Telemetry sensor and system port Fail safe and hold mode Compatible with Transmitters using Hitec AFHSS 2.4 system Single BODA (Boosted Omni-Directional Antenna) Scan mode selectable Two year limited warranty beginning at date of purchase INCLUDES: One Optima 7 2.4GhZ receiver REQUIRES: Hitec AFHSS 2.4GhZ transmitter SPECS: Dimensions: 57 x 21 x 11.4mm (2.24 x 0.82 x 0.44in) Operating Voltage: 4.8-7.4V from receiver battery power or ESC 4.8-35V using SPC function lmm 12.3.09 ir/jxs