The range is compatible with Friedland Evo portable and mains plug-in mounted chimes, and Friedland Visiocam wire free security products. Multiple chimes can be used together with several bell pushes, to extend a wireless chime system. The D471 Wirefree Extender/Converter, allows the chimes to be used with a traditional wired system, or merely to use a more aesthetic wired bell push, such as those under "Wired Bell Pushes" . All chimes, have a sound level of 78dB@1m, and operate on a frequecy of 433MHz
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