Thank you for viewing. This is the CAR MATE SQ900 car security system. It activates and deactivates the security system using your original keyless entry system, simply by plugging it into the OBDII connector. It features an answer-back function and a siren. It was working without any problems until it was removed. The instruction manual has some minor stains. The blue LED is noticeable at night and should help deter theft. You can customize the sensitivity settings to your preference, as there are multiple options. Product Description: Convenient security system that turns the security ON/OFF with the operation of the original keyless entry. Alerts you to vehicle abnormalities (impact, tilt, door opening, ignition ON) with sound and light. Uses "OBDII power," which requires no battery replacement or charging. Easy wiring, just plug it into the vehicle's diagnostic connector. Equipped with a 3-axis MEMS acceleration sensor. Performs data communication from the OBDII connector to detect door openings and ignition ON, and can flash the vehicle's hazard lights. Please refer to the CAR MATE website for compatibility information. f2330-2512021980