This is the Spectra 2.4GHz Module and two Optima 9 9ch 2.4GHz Receivers from Hitec. FEATURES: Receivers- Dual LED status indicator with low battery warning SPC (Supplemental Power Connection) Telemetry functions (with Hitec Spectra 2.4 module) include Temperature (4) RPM (2) Fuel Gauge, GPS (speed, altitude, coordinates) Fail safe and hold mode Compatible with Transmitters using Hitec AFHSS (Adaptive Frequency Hopping Spread Spectrum) 2.4 GHz system Dual BODA (Boosted Omni-Directional Antenna) Smart Scan mode selectable selects between normal and scan [1]mode 2[IMAGE].4 signal types Module- Smart Link Sensor data output and system upgrade connector port, when used with the PC Interface (HRCM4470) this port serves to upgrade the software and downloads info from receiver"s onboard sensors Two year limited warranty through manufacturer on both components beginning at date of purchase INCLUDES: Two Optima 9 2.4GHZ receivers with two BODA antenna holders, Spectra 2.4GHz Module with two antennas and instruction sheet REQUIRES: Hitec AFHSS 2.4GHz transmitter SPECS: Optima 9 Receiver (HRCL9000) Dimensions: 1.89 x 1.12 x 0.44" (48 x 28.4 x 10.6mm) Weight: 0.77oz (22g) Operating Voltage: 4.8-7.4V from receiver battery power or ESC 4.8-35V using SPC function Max Current Consumption: 190mA Spectra 2.4GHz Module (HRCL4500) Dimensions: 1.5 x 2 x 0.88" (37.5mm x 59mm x 22.4mm) Weight: 1.2oz (35g) jxs 02/22/10 ir/jxs 1. #