The Greenbrook DAT01A Bell Transformer is designed for use in conjunction with the Greenbrook hard wired door chimes when you want to convert an existing door push to an illuminated one. This transformer from Greenbrook is designed for use in conjunction with the GreenBrook hard wired door chimes when you want to have convert an existing doorpush to an illuminated doorpush. This doorbell transformer supplies power for 4v, 8v or 12v door bells rated up to 1A. Input: 220–240V AC, 50Hz Output: 4V, 8V, or 12V AC, 1 amp Dimensions: 82mm x 57mm x 43mm Conforms to EN60 742: 1989 Instruction Manual Comes with a 12 month manufactures warranty.