password locks belong to category 6. Password lock belongs to smart home category in Tmall, and password lock (non-electric) belongs to category 61 of category 6 of trademark classification; According to the statistics of signpost network, there are 9 registered trademarks of password locks (non-electric). Password lock is a kind of lock, which uses a series of numbers or symbols when it is opened. Text password lock can be divided into mechanical password lock, digital password lock and so on.