This is the Telementry System SBS-01RM RPM Sensor (Magnet type)

FEATURES

This sensor provides the RPM of a motor to a Futaba telemetry enabled transmitter

INCLUDES

Two screws
Two nuts
Two cylindrical magnets
Four flat washers
Two lockwashers
Sensor unit
Adapter cable
Instruction manual
Warranty sheet

SPECIFICATIONS

Length: 10" (255mm)
Weight: 0.166oz (4.7g) with pickup
Voltage: DC 3.7-7.4V
Range: 37 to approximately 100,000RPM