What is No Stress lifetime ?
No Stress Beaconare provided with easily replaceable standard batteries : No Stress is not limited in time. The batteries, according to your use, will allow about 230 hours of supervision, a swimming season.
No Stress notifies you if a No Stress Beacon batteries are running low. Two levels of information are provided: low autonomy (a few hours bathing in peace); critical autonomy (too late, you must quickly change the batteries !)
You prefer to switch to No Stress supervision on your smartphone ? Same principle.
We advise you to always have extra set of batteries (CR2032 for No Stress Beacon).