Robust and works well,
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This review is from: Byron Sentry BY102 60m Wireless Plug-In Door Chime Kit with 4 Sounds (DIY & Tools)
Easy to put together with clear instructions. Bell is loud but not annoyingly so. The unit that fits on to your door is plastic but should withstand even the most heavy handed postmen or delivery driver. The plug in bell unit is a great idea and saves the hassle of changing batteries every other month or so. For the money I am happy with this product.