Futaba SBS-01RO 18MZ 14SG Optical RPM Sensor FEATURES: This sensor, when used in conjunction with a telemetry-enabled radio system, is used to indicate the rotation speed of a propeller, rotor, o INCLUDES: One RPM sensor with attached cable One plastic mounting bracket Two pieces of double-sided foam tape One instruction sheet One warranty shee REQUIRES: Connection to S.BUS 2 system