Grothe Mistral 600
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Probably the best wirefree portable doorbell on the market. Fantastic German quality starting with a robust 500m push button which is IP44 rated. The chime unit is portable or wall mounted and has a series of changeable motifs to decorate the front of the unit. You can even use a photograph of your own choice which would sit nicely behind the glass effect panel. A choice of 17 polyphonic chime sounds is standard on this unit at a sound level of 83dB @ 1 metre. Not troubled by any interference of other wirefree products as it operates at the less crowded frequency of 868mhgz. The push can also be used as a wired to wirefree converter which means you can keep your existing traditional wired push at your front door and just connect to the terminals inside the push button. This can be powered by batteries (supplied) or via a 1 amp transformer.