Are Austrian doorbells commonly fed by an outboard transformer or is the bell itself designed for connection to the 220 volt mains?

While in Tijuana, B.C. I saw for sale in a discount superstore a doorbell designed for connection across our 120 volt mains. The label on the back of the blisterpack said it was made in England.

Should have bought it....not enough money though. First time I ever saw those. Normally the bells I've seen get their power off a small step-down transformer.