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Our company is the source factory for wireless doorbells/pet doorbells, offering wholesale services, exclusive supply, and custom free mold making. Welcome to inquire. The N66 receiver is available in plug-in and battery-powered versions, please make a note when placing your order according to your needs Plug-in model: The receiver plugs directly into an outlet, the transmitter uses batteries. Battery version: The receiver uses 3 AAA batteries, the transmitter uses batteries, and it is universally compatible. The plug-in model comes with US, UK, European, and Australian plugs, please make a note when placing your order. The N66 receiver can be used with all of our transmitters, and can also be purchased in multiples. See SKU for details or consult customer service. All transmitters in this link use 12V23A batteries for power, with a lifespan of approximately 1 year based on 20 uses per day