Product Name: GSM Auto Alarms with Built-In Locating DevicesModel Number: D-2731Place of Origin: ChinaFeatures: 1) Two-way mutual response 2) Detecting function 3) Basic transmitter functions: arming, disarming, car locating, anti-hijacking and engine shut-off 4) Voice reminding function 5) Password changing 6) Anti-false warning 7) Silent for environment conservation 8) Car locating 9) Anti-hijacking 10) Central lock automation 11) Roadside parking warning 12) Remote truck release 13) Arming reminding 14) Trigger memory 15) LED trigger memory Packing: Color box