... the alarm spot.Listen-in function: Can clearly hear the voice, footstep, and so on.Support 3 wired inputs (normally closed)and 16 wireless ... 250*140*32mmStandard pack components 1 main panel, 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 MMS&SMS function