... ,led sensor 3.100% high quality,warranty 1 year GPS tracking chipDisplay Size: 78 * 28 * 21 (mm) Detection distance: ... zone, caution zone and danger zone·Display mode: LED lights in 3 colors of green, yellow and red turn on ... zone, caution zone and danger zone·Display mode: LED lights in 3 colors of green, yellow and red turn on ... ; Digital distance display GPS/GSM/GPRS tracker,gps tracking chip