VJOYCAR Wireless Car Alarm 2-Way LCD Pager Remote Control DIY Install, Universal Vehicle Anti-Theft Security Siren Horn System with Shock Vibration Window Door Trunk Open Alarm. Wireless Car Alarm System: different from the normal car alarm, this car alarm system doesn't have main unit box, doesn't have many cables, no need cut any origianl car cables, no damage to original car circuit, the shock sensor and the air pressure sensor are wireless to siren. 5 minutes to DIY Install: just need connect the siren black / red cable to car battery positive and negative port, then connect the high frequency antenna to siren connector, find a location and fix siren around the wiper, installation done!Don't like the normal car alarm, no need send to the car service shop for professional install, cost effective. Built in air pressure sensor, when detect car door/window/trunk open illegally, the siren will alarm, and notify to LCD remote control; built in vibration/motion sensor, when detect car vibration or motion, the siren will alarm and notify to LCD remote control also. The high frequency antenna ensure the car alarm system can be valid for 1000 meters. Universal for cars 12-15V power input, pls don't install it if more than 15V voltage. Please contact with us at any time if you need assistance during installation or usage. Any product you return must be in the same condition you received it and in the original packaging. We usually respond within 24 hours on weekdays. Thank you for shopping at our store.