- Valcom loud warble horn - External audible signal device - 90 Vac ring 18 Vac buzzer voltage activation - Connects directly to PBX or station lines - Built-in tonegenerator 5 Watt amplifier and volume control - Dimensions: 6.5inchH x 8.2inchW x 10.4inchD - Weight: 4.7lbs - VALCOM POWER UNITS: (-10) - Beige