后门是五锁连环栓，单回路报警系统，小菜一碟。

Back door has a five-pin tumbler system, single-circuit alarm. Child's play.

youdao

产品包括：U型锁，前叉锁，圈形锁，钢缆锁，钢丝锁，碟刹锁，链条锁等。

Products include: U lock, lock front fork, JuanXing locks, cable locks, lock wire, disc brake lock, chain, etc.

youdao

产品包括：U型锁，前叉锁，圈形锁，钢缆锁，钢丝锁，碟刹锁，链条锁等。

Products include: U lock, lock front fork, JuanXing locks, cable locks, lock wire, disc brake lock, chain, etc.

youdao