... will be locked automatically, SMART AUTOMATIC RECOGNITION: 1.Speed lock device can automatically identify four door is closed ... the main switch lock, in the back door can be opened.In the driving process, the rear ... without the main switch, in the back door can be opened,after the speed up to 8KM and ... (within 2 seconds from 50KM, to 0KM), It can avoid a dangerous when the car driver meets accidents ...