Futaba SBS-01RB Brushless Motor RPM Sensor FEATURES: Compatible with the Futaba 18MC-WC 18MZ 18SZ 14SG 10J 6K 4PX-R 4PX 4PV 4GRS and 4PLS systems For use with Futaba telemetry transmitters and receivers Allows RPM of brushless aircraft motor to be viewed on transmitter also works with helicopter rotors airplane propellers and brushless car motors One year limited warranty through Hobby Services beginning at date of purchase;INCLUDES: Brushless Motor RPM Sensor with ESC and S.BUS2 Leads with Connectors Instruction Sheet;SBS-01RB Brushless Motor RPM Sensor