Revex Expansion Receiver Chime Wireless Chime XP700 Battery-powered Indoor B-2883 This product is new and unused. The cellophane tape was removed from one place for the purpose of photography. Easy to install without wiring, and expansion is also flexible. It notifies you with "sound" and light when it receives radio waves. Installation: Indoor Dry cell / AC adapter use (Power supply: 3 AA alkaline batteries (sold separately) / AC adapter (sold separately) cannot be used together) / Battery life: Approximately 6 months (10 receptions per day, at 20°C) Radio wave reach: Up to 180m outdoors / Up to 90m indoors Reception lamp display: Blue lamp flashes / Operation mode: Sound and light, sound, light Volume (8 levels with the maximum button): 45-90dB/1m