Hitec 55846 HTS-SS Blue Full Pack Hitec compact sensor station collects data from each sensor of your electric powered aircraft sending it back to your transmitter via the Optima 7 or Optima 9 omni-directional receivers Features:4 Temperature Sensor Ports (HTS-TEMP) 2 RPM Sensor Ports (HTS-RPM) Current Sensor Port (for 50Aor 200A Sensor) Voltage Sensor Port GPS Port (HTS-GPSAdditional featues:May be installed in nearly all electric