All Genesis speakers include a DC blocking capacitor to allow electrical supervision of the audio distribution circuit. Models for 25 VRMS and 70 VRMS circuits are available. The mylar speaker with its sealed back construction provides extra durability and improved audibility. Ã‚Â¼ W to 2 W operation is selectable with a conveniently-located switch on the bottom of the device. The wattage tap setting remains clearly visible even after final installation.