... English message;6. The main unit can be used as a telephone;7. Arm, disarm, monitor, and intercom by phone ... sensor does – can accept? ------- It can accept unlimited wireless sensors including door,PIR sensor,vibration sensors,smoke sensor,gas ... Volume: 110dBStandard pack components1 main panel, 1 wireless infrared (motion) detector, 1 wireless door magnetic detector,1 siren, 2 remote controllers ...