Jeti Telemetry Sensor RPM Opto MRPM EX T-Shirt all three green LEDs are

all three green LEDs are ON

Telemetry Cont/Max Amp 130/300A Cells NiMH/NiCD 6-40 cells Cells Li-poly 2-12 cells Voltage 5-51V Programming JetiBox

Duplex Expander or hand-held when connected directly to a JetiBox Profi

Improved swash special mixer: allows mixing yaw to swash servos

fix pitch or 3D helicopters (constant RPM)

Jeti Telemetry Sensor RPM Opto MRPM EX T-Shirt all three green LEDs areThe Opto MRPM EX sensor is used to optically measure the speed (RPM) of propeller driven models. The optic sensor calculates RPM by monitoring the interruption of light (sunlight or incandescent light). The optical sensor is housed inside a metal tube to help reduce unwanted reflections for better accuracy. Using the JetiBox, the Opto MRPM EX allows you to set your propeller blade count, multiple alarms and can even display the motor power in Watts.