: This adapter is designed for use with the 1Byone Driveway Patrol Alert Alarm System. The DC input port is on the topographic point good side of the receiver. If you do not to use 3 x 1.5 V type C batteries for the receiver, just connect this AC power adapter. : Do not use batteries and the AC adapter at the very time to avoid battery leakage and combustion. Please the batteries before connecting the adapter to the DC port. Here at 1byone, we by our products 100 % with a 12-month warranty. A paradisal purchasing experience is our # 1 and we will happily send a product replacement if any issues arise.