... sensor does – can accept? ------- It can accept unlimited wireless sensors including door,PIR sensor,vibration sensors,smoke sensor,gas ... :900/ 1800/ 1900MHzBack-up Battery:NI-HI AAA*6 DC7.2VSiren Volume: 110dBStandard pack components1 main panel, 1 wireless ... infrared (motion) detector, 1 wireless door magnetic detector,1 siren, 2 remote ...