2-to-1 Pairing for Dual Doors2 self-powered doorbell buttons + 1 plug-in receiver, perfect for homes with front/back doors, shops with multiple entrances.Self-Powered & No Battery RequiredKinetic energy generation by pressing, no batteries needed, forever maintenance-free, eco-friendly and convenient.IP68 Waterproof & WeatherproofIP68 highest waterproof rating, works in rain, snow and extreme weather, ideal for outdoor installation.4 Volume Levels & 50+ Melodies4 adjustable volume levels (mute to 110dB), 50+ optional chimes, customize your doorbell sound for home/office.Easy Plug-and-Play SetupNo wiring, no drilling, plug the receiver into power and pair in seconds, ultra-long range through walls/floors. | Cluzine | | Self-Powered Wireless Standard Doorbell, 2 Buttons 1 Receiver,IP68 Waterproof, 4 Volume Levels | Best Buy