Main Function: For the systems without automatic satellite tuning capability. Connect to your LNBF and receiver to the satellite finder to track the clearest setting for the satellite you wish to tune to. Meter with LED displayer helps you know the strength of the signal clearly Meter with audio tone helps you align satellite antenna to signal. Audio signal gets louder at the best setting. Works with multiple dish systems. Close or open the audio tone With four steps gain for the satellite signal,you can increase or decrease the gain of the meter Specifications Frequncy Range: 950-2150 MHZ Supply Voltage: 13-18V DC Input Level Range:-40dBm~~-10dBm Operating Temperature: 0~~+40°C Impedance: 75Ω