So it needed a digital timer!
This model of TFA proved to be particularly suitable. The alarm may be due to magnet attached to any metallic object in the kitchen (the cooker hood or refrigerator door is very good).
The signal at the end of time is sufficiently loud, so you it can also perceive good in other rooms and the battery lasts me for more than 18 months in almost daily use.
So there is nothing to fault, the device does exactly what it is and very good man be accessed here without hesitation.
