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Coolqiya Wireless Doorbell Chime with 1 Remote Waterproof Transmitter and 2 Plugin Receivers, Operating up to 300m Range, No Battery Required for Receiver 58 Chimes, 5 Level Volume, LED Flash.
Yotsuba
Wireless Door Bell Chime Waterproof Doorbell Plugin Receiver 300M Long Range Remote Door Bell Ringer Wireless Portable Doorbell with 1 Waterproof Transmitter and 2 Plug-in Receivers