BA2DA - TXFR 10V 500MA IP115V WITH WIRE BOX MOUNT CIR 21MM HOLEFeatures Used in chimes door bells security systems decorative lighting furnaces humidifiers appliances vending machines intercom system type applications. Rugged low noise cool running design indoor use only. Stripped wire input (primary) leads screw terminal quick fit tab terminal output(secondary). Nipple locknut mount for box installation complete with locknut and mounting bracket Input leads are black on 240V models 240V lead is red. All models