Not sure if this has actually been used but as the packaging is tatty, I have to assume it was used. I've tested it and put brand new duracell batteries in the pendants and made sure they synced to the base station correctly. All working great. If the pendants need paired again it's a simple process. Lifemax Home Safety Alert Elderly Panic Alarm Paging System Wearable Pendants. The alarm unit includes a mains supply and will also work on batteries
