The Model 710 is designed for high risk prisoner restraint and transport situations. The Model 710 does not operate with a standard handcuff key. The Model 710 incorporates Model 700 Chain Link Handcuff with a MEDECO® or ASSA® Desmo high security lock system and Lexan® polycarbonate housing. MEDECO® and ASSA® Desmo are recognized leaders in pick resistance lock systems. Multiple sets can be ordered with two different key options. Each set can be keyed alike or each set can be keyed different. Both MEDECO® and ASSA® Desmo use restricted key control systems to prevent unauthorized key duplication. The Lexan® polycarbonate housing is nearly unbreakable and is color coded orange for high visibility. Other features include spun rivet construction, double lock capability, and profiled edges to reduce risk of tissue and nerve injuries. All products come with two keys, a double lock activator, and a lifetime warranty for manufacture defects. Made in USA. NOTE: For more info CLICK ON PICTURE