This is the FrSky FAS-40 Battery/ESC Current Sensor. The FAS-40 can be used to measure the Current (A) and Power Consumption (mAh) of the battery and/or ESC.
Measurement range: 0-40A
Maximum safe current: 40A
Sensor current consumption: 20mA
Update Rate: ≥ 1Hz
Note: The FAS-40 should only be used with FrSky Two-Way (telemetry) receivers that provide data-stream port, such as the Taranis X9D PLUS (FRKX9DPLUS-CASE).