They do. A low pitched beep giving approximately 30 mins before a 2nd beep and they usually go dead minutes after the 3rd beep.
Edit: freebie NHS aids here 🙋‍♂️
They do. A low pitched beep giving approximately 30 mins before a 2nd beep and they usually go dead minutes after the 3rd beep.
Edit: freebie NHS aids here 🙋‍♂️
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