... is happened, it can track the alarm zone by real time through long-distance. Specification:1. Wireless ... detector, gas leakage detector, vibration sensor, siren with strobe light, flashing siren, horn siren, remote control, all sensors ... sight of payment.2.We normally send goods by DHL,UPS,TNT,FEDEX.3.We warrantee ... new one for customers if that is notcaused by mis-operation.The fregiht from customer's ...