We are the largest manufacturer of Tower Crane`s safety system in China,and we are a professional manufacture of Tower Crane`s Safety System with 14 years experiences in China, offering over 5 various kinds of safety system and monthly output up to 60 pieces. Our main products :I Tower Crane`s Load Moment Indicator II. Anti-Collision and Zone Protection System for Tower cranes .I. Tower Crane`s Load Moment Indicator Display height ,weight, radius ,slewing degree, the moment percentage with black box which can record 5000 times work condition . If the load reaches 90% of the crane rating or the specified moment, it will give an early warning. If it reaches 105%, it will alarm and stop the trolley automatically from moving outward and the hoist from lifting upward. II. Anti-Collision and Zone Protection System for Tower cranes A wireless protection system for max 9 unites tower cranes in a working site. Entry of datas from all tower cranes can be done easily at the computer at site office. It can afford two or more cranes collision route protection , 10 prohibits zone protection and 30 not gone verges. with black box record .