Hotel alarm clock during working hours

Generally, star-rated hotels have a very humanized service called "MorningcallService/Wake-upcall", which means to call (or directly knock on the door) at the appointed time in the morning to wake up guests, or to have dinner in the morning or to have something important the next day. Wake-up service can usually make guests sleep peacefully without worrying about oversleeping and missing important things. Usually the computer wakes up the phone (very timely, not easy to forget). In the case of not waking up the guests, you can only wake up manually.