标配双电路系统（仅限B601系列&B660系列）
双电路：内置两套电路系统，当主电路系统出现故障时，还可以通过备用电路系统进行开锁操作。
双应急开锁工具：C级机械钥匙+智能化应急开锁工具：当门锁主系统发生故障时，将手持机连接到门锁外接电源口后，输入门锁管理密码即可使用备用系统开锁。
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