- This is the recommended transformer for the Nest Hello Doorbell. - It's the only transformer that has a 16 volt output compatible with UK Door Chimes - This has been produced for the Nest Hello Doorbell for use in the UK - Other transformer will blow the circuits in your Door Chime rendering it useless - Please note all electrical work should always be performed by a qualified technician The Nest Hello Doorbell is NOT included, this listing is ONLY for the transformer If you do not know how to fix this please contact your Professional electrician.
