this repeater in a thumb sized housing is plugged in a 5V net power adapter and will double the wireless range of all sensors ( except AiS All-in-sensor, they use her own repeater and radio protocol) and switches and siren.
Please notice that all siren, alarm speaker and switches offer a repeater, you need this mini size repeater only if there is Problems with wireless signals and you don’t use one of the products with repeater.