HB-105-2The line powered 105dBA HB 105 2 Tonecaller is a telephone extension sounder which has been designed for installation in large areas which have high ambient noise levels so that a ringing telephone can easily be heard. The unit is rated to IP66 and is suitable for operation in adverse conditions. The HB 105 2 Tonecaller is designed to replace traditional mains powered bells, and is powered by the PABX and PSTN line voltage (60 100 volts AC). A
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