AUKEY Wireless Doorbell and receiver IP55 Water resistant + 24 month warranty – £8.99 (Prime) £12.98 (Non Prime) at Sold by AUKEY direct and Fulfilled by Amazon

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An extremely simple, reliable, and effective wireless doorbell set. Includes two receivers with four volume levels and a wide variety of bell tones to choose from
Dust and Water-Resistant (IP55 Rating) for protection against heavy rain and other extreme conditions outside. Fit it without worry and use it for years
Extended 150m / 492ft receiver range so you can place the receivers almost anywhere around the house and always hear them. Anti-Interference from ant nearby wireless products. No troubles of Error Alerts
Quick and Easy setup. No wires to fit or screw holes to drill (screw use optional). Just stick the doorbell securely by your door and plug the receivers into any power sockets around the house. No connection procedure, as transmitter and receivers come pre-programmed for wireless connection
Package Contents: AUKEY WD-TD04 Doorbell Transmitter, Two Doorbell Receivers, Self-Adhesive Mounting Pad, Two Mounting Screws & Anchors, User Manual, 24-Month Product Replacement Warranty and Friendly Customer Service