Wēnxīn tíshì: qǐng bǎoguǎn hǎo nín de suíshēn wùpǐn.
Friendly reminder: please look after your personal belongings.
Tips
culture
The standard heading of public notices in mainland China: on trains, in hotels, in apps and next to wet floors. People also use it jokingly in chats to soften a nag.