Features: * Battery operated * 3 sound options set at chime button * Uses two 3-volt lithium batteries (installed) * Different sounds for front and back doors * 32 changeable codes to prevent interference, adjustable volume * Paintable doorbell button for a custom look * Up to 150-foot operating range * Double-sided tape, screws, and wall anchor provided * Chime uses (4) alkaline C batteries (not included) What"s In The Box: * Thomas and Betts Carlon RC3520 Wireless Step Up Door Chime