The batteries ought to be changed once a year. Make it a habit to change the batteries on December 1. because that is the month when the most fires occur!
If your sfty Sense starts to beep at repeated short intervals, or if you receive messages about a low battery in your sfty app, the batteries need to be replaced. Always keep an extra set of batteries in your fridge.
O.B.S! Lithum batteries are non-rechargeable.
Test your sfty Sense once a month by pressing the Test button, press it again to switch it off. The product must also be vacuumed at regular intervals.