Free cable free installation,which used to buy.
Sensor alarm for car detects glass breaking, trunk opening, impacting, and door opening etc. It also effectively prevents error reporting due to vibrations caused by thunder, firecracker, and vehicles passing by. The anti-theft enable/disable is activated by SMS messages, phone calls or remote control. After the alarm is triggered, reporting is sent out via messaging and a pre-set call is placed to inform the car owner. The car owner will hear voices/sounds inside the car to determine the emergency situation. The alarm will place calls to the receiving mobile numbers as a reminder. When one of the calls is answered, the calling stops. If not, calls will be placed in turns 5 times. The interval between two reports is 3min. Under test mode, the time is 15sec.
You can continued a wireless siren.