Valcom V-9925A Loud Warble Ringer Horn<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>90 Vac ring， 18 Vac buzzer voltage activation</li><li>Connects directly to PBX or station lines</li><li>Built-in tone generator</li><li>Built-in 5-watt amplifier and volume control</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31v4Pc2JAOL.jpg" noproxy>