7770-Wired-Transformer-White-8V-1-Amp-Byron-7770-p-The-Byron-Wired-DIN-Rail-Transformer-needs-to-be-installed-by-wires-and-is-suitable-for-wired-doorbells-A-normal-doorbell-is-powered-by-a-low-voltage-The-transformer-converts-the-high-230V-mains-power-to-a-low-8V-power-The-use-of-a-transformer-is-therefore-essential-for-wired-doorbells-p-p-Comes-with-a-24-month-warranty-p-p-1-x-Byron-7770-Wired-Transformer-White-8V-1-Amp-br-1-x-Instruction-Manual-p-Byron-7770-Wired-Transforme