Futaba SBS-01RB Telemetry System RPM Sensor Brushless Type FUTM0857

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 the Futaba USA Service Center
beginning at date of purchase

Brushless Motor RPM Sensor with ESC and S.BUS2 Leads with Connectors
Instruction Sheet

Length: 18.7" (475mm) including cables
Weight: 0.134oz (3.8g)
Voltage: DC3.7 - 7.4V
Range: 360 - 300,000RPM