UNIVERSAL Floor Heat System LoudMouth Installation Monitor, 9 Volt Battery IncludedHow the LoudMouth Works: Insert each lead wire from the heating product into L1 and L2 terminals (no polarity) with the ground wire inserted into the G terminal. Tighten the terminal screws onto the wires. Set switch to ON position. Green light indicates the LoudMouth is operating. The red light and alarm indicate lead wires have come loose from terminals or damage has occurred to the heating product. Press the TEST button to simulate a damage