Have previously so some cheap products tried and was always disappointed: Time ringing at leisstesn breeze, sometimes ringing only when you have pressed the button almost into the case, sometimes simply do not. Not so with Grothe! The ring whenever he is there; in a manner that completely convinced me: With small, noticeable pressure on the button, the adjustable bell rings. The Batteriwechsel for Gong have also one more power supply to buy, so omitted in the house. There is nothing I would have to complain about.