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You?ll never be out of earshot of this Portable & Plug-in Cordless Doorbell Set. That?s because it has two receivers - one that plugs into a wall socket and one you can carry from room to room out into the garden, the garage or shed. With a choice of 32 melodies and 4 levels of adjustable volume up to a loud 100db, its operating range is 150m (492ft), with flashing LED alert. Simply plug the receiver into a power socket and attach the remote bell push to the exterior wall with the provided screws, or get double-sided tape. The bell push is IP44 weatherproof and fitted with an energy efficient CR2032 lithium battery, with a lifespan of up to 3 years. Advanced self-learning technology avoids any interference from other equipment in your home. Portable receiver requires 3AA batteries (not supplied). | Easylife Cordless Portable Doorbell Set