Usage: can be automatically retraction and automatic locking device in the case, can control the length of the cable out and bounce back after Good telescopic design to take up less space, easy to use. Enclosure protection device effectively avoid the wear of the cable, prolong service life, and the use of scale easily. 6 m telescopic work can flexibly fixed, not restricted by working space, cable length can be adjusted within the prescribed scope, swing can be 180 degrees scope of work, (with extra 5 meters 8 square meters electrostatic copper wire)