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Gyro & Acceleration Sensors
Proximity Sensors
Radio
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Telemetry Kit
FPV 433Mhz Radio Telemetry Kit 100mW V1.1:
http://www.hobbyking.com/hobbyking/store/__42847__FPV_433Mhz_Radio_Telemetry_Kit_100mW_V1_1.html
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http://www.hobbyking.com/hobbyking/store/__42847__FPV_433Mhz_Radio_Telemetry_Kit_100mW_V1_1.html