Do you have a cell phone pager with one-click dialing? You don't need to install an APP, it's too much trouble.

Do you think there is a cell phone pager that can dial with one click? I don't need to install application code. I am bored. I just have a button like a doorbell. It's best not to charge it. Old people can use it at any time. If you press it, it will be loud. Your mobile phone, did you say starlight bell? Under normal circumstances, it also needs to be recharged. There are no electronic devices that need to be charged. You can use it all the time, like a starlight safety bell. It is waterproof and has many protective functions. And as you said, you can press a key to connect a specific mobile phone, but you need to charge it.