GSM Alarm System: 1. Host one (including antenna) 2. ... the user can be pre-recorded 10 seconds alarm voice alarm voice broadcast.2, the host can set the ... surrounding zone, internal zone, 24-hour zone, sound alarm, silent alarm types for different occasions.5, cable zone (normally ... to ensure that power to work.16, all wireless systems, especially for garage, warehouse and other areas inaccessible ...