The Greenbrook DAT03A 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 is a tripple DIN rail mounted module with fully segregated primary and secondary connections. This doorbell transformer supplies power for 4v, 8v or 12v door bells rated up to 2A. Input: 220–240V AC, 50Hz Output: 4V, 8V, or 12V AC, 2 amp Dimensions: 91mm x 53mm x 65mm Instruction Manual Comes with a 12 month manufactures warranty.