TekTone ;s SS102A and SS106 Class 2 Transformers offer compact, easy-to-install low voltage AC power sources for use with various TekTone ; intercom systems. Both transformers are UL ; Listed and will safely take themselves offline when overheated. The transformers are constructed for easy installationin a standard 1/ 2" knockout or for surface installations, and may be used in plastic or metal boxes. Primary wire connections are made using the pre-stripped pigtails and ground wire; secondary connections are made using screw terminals. Also known as -Tektone Sound & Signal Mfg,Inc TRANS 8VAC20VA, 16/ 24VAC 30 VA - T9-SS106