Wattstopper Watt Stopper 120/230/277V 20 amp Power Pack BZ-50 Automatic or manual switching options Simple retrofit installation and operation; no Neutral needed Shutoff warning with optional audible beep during grace period Pushbutton overrides the shutoff event Multi-way operation for 3- and 4-way switching Wattstopper AS-100-I 120/277Vac Ivory Occupancy Sensor automatic Control Switch