2 . before using this product , it is required to check the appearance of safety rope and conduct trial lock for2 - 3 times trial lock method : it is easy to pull out roll - up safety belt , which muse be locked if it is pulled forcibly and can draw back into the device while loosening hand . if safety rope can not draw back into completely , just pull it out a little bit and that will be ok 2 .使用本品前應對安全繩外觀做檢查,并試鎖2 3次試鎖方法:慢慢拉出卷收安全帶輕松自如,用力猛拉卷收安全帶應能鎖止,松手時安全帶應能自動回收到器內,如安全帶繩未能完全回收,只需稍拉出一些安全繩即可。