... display holder Function: 1) Host Base with Charging Function, Charging weekly , Repeated use. 2)Display Charging Function apply to : Mobile Phone , ... Alarm Function :Voltage Less 3.3V Alarm ,remind the charging 5)Short Circuit Alarm Function : circuit is short-circuited ... holder Security display holder are composed of the host alarm system, multi-touch alarm sensor, 3M adhesive and other components ...