This is the HTS-Temp Temperature Sensor from Hitec. FEATURES: Measures airplane electronic temperatures from -40 to 392 degrees Fahrenheit For use with Hitec Telemetric AFHSS System INCLUDES: Two temperature sensors REQUIRES: Hitec Telemetric AFHSS System SPECS: Overall length: 14.5" (368.3mm) COMMENTS: For additional information contact Hitec lmm 9.30.10 ir/jxs