The 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 variable output of 85 – 105 dBA is obtained by means of a potentiometer located within the unit.