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When your phone rings, you need to know it The MyAlert telephone ring alert is a cost effective way to ensure that and the attractive design fits with any decor. With an extra-bright LED flasher and extra-loud 100db sound, the TR500 is powered by the telephone line and requires no batteries. It is easy to setup by simply plugging in the provided phone line to your existing telephone line. No power supply and nothing to program it's that simple.
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