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Wireless RF 433MHz Doorbell | 30 Songs, 150M Range, 3-Volume Levels, Pre-Paired – Plug-In Receiver & Button Transmitter Color:RF433 Receiver 2–6 hrs: Milk Thistle promotesNever Miss a Visitor Wireless Doorbell with 30 Songs & 150M Range Upgrade your homes entryway with this wireless RF 433MHz doorbell. With a 150 meter transmission range, 30 selectable chime melodies, and three volume levels, this doorbell is easy to set up and reliable in everyday use. The receiver plugs directly into any standard outlet (DC 5V 1A USB), and the compact button transmitter mounts anywhere at your door. Best of all, it comes pre paired