The Potter-Amseco PBA2410 is a 10", 24 VAC, vibrating bell ideal for use in fire, burglar, or general signaling devices.The PBA2410 mounts easily to a standard 4"x4" electrical box and comes in a red, powder coating. With a low power consumption but surprisingly high decibel rating, the PBA2410 boasts incredible power efficiency.The bell is designed for indoor and outdoor use. However, a weatherproof backbox is required to install the unit outdoors. Also known as -POTTER PBA-2410 POTTER 24VAC 10"BELLS