The interior siren with built-in battery and 433MHz receiver gives a 105dB modulated sound. Maximum distance between control panel CE1 and the wireless interior siren: 30m (optimum range: from 15 to 20m). A 220Vac/12Vdc (300mA) charger supplied with the siren ensures maintenance of the battery charge. It is unnecessary to add an SI1E transmitter except where the SI1K siren is to be used with a control panel other than the CE1.

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