... 2.Display the intensity of optical signal. Low electricity Detailed Product Description1. Identify multiple signal frequencies, i.e. 270Hz, ... and 2 kHz.Display the intensity of optical signal. Low electricity indication. Show the direction of optical transmission ... ModelSAT-6CLED displayNo Signal, direction, frequency(270Hz, 1kHz, 2kHz), power display, and low power indicationDetecting Range-38 ...