GPS tracking chip 1.Detection distance: 0.5 ... ,led sensor 3.100% high quality,warranty 1 year GPS tracking chipDisplay Size: 78 * 28 * 21 (mm) Detection ... sound or human voice alarm is optional Simulative in three colors Direction indicator of left, middle, ... in order when obstruction move closer within 2.5m; Obstacle orientation indication; Digital distance display GPS/GSM/GPRS tracker,gps tracking ...