... alarm spot.Listen-in function: Can clearly hear the voice, footstep, and so on.Support 3 wired inputs ... buttons and so on.Support 1 output for relay linkage, remote controlling appliance swSiren port for shift between silence and siren. ... 1 wireless PIR detector, 1 wireless door sensor,1 siren, 2 remote controllers, 1 camera, 1 GSM antenna and 1 RF antenna ,1 power supply, 1 manual GSM alarm system with ...