Variometer Sensor Vario-High Precision
Measures: -700 to 10000m with 0.11m resolution  
Operational voltage: DC4-10V
Operational Current: 30mA
Dimensions: 31 x 18 x 6mm (L x W x H)
Weight: 3.1g

Features:
Calculates the altitude by reading barometric pressure.
Used with a compatable telemetry receiver and transmitter, sensor data can be send back to ground and used to provide alarms, logs, and other useful information.
This sensor uses the FrSky's new Smart Port digital protocol which can be connected direct to the new FrSky 'X' receiver or a digital port on the D series receivers.