Parking sensors system comes on automatically when reversing ã??ã??ã??ã??ã??ã??ã??ã??ã??ã??ã??ã??ã??More sensor colors available to satisfy full needs of consumers Digital distance display of obstacles screen Real voice alert to driver ã??ã??ã??Voltage:12-16 V DC ã??ã??ã??ã??Working temperature: Detective range:0.2-1.5m ã??ã??ã?? Operating frequency:40KHZ 6"and 7"can be supplied