The PA 01 is a one-channel photoelectric amplifier developed by Telco Sensors. It is specifically designed to be used in conjunction with a set of LT remote transmitter and LR receiver from the 101/100/110 or 120 selection. The amplifier is available in either automatic or manual sensitivity adjustment with/without a 0 - 10 second on/off time delay. This adjustment is made possible by the integral potentiometers in the front panel of the amplifier.