Its posible to do a pannic button with a "remote control 433" and a "Sonoff RF Bridge 433"?
I want to do that when I press any button of the remote control, appear a notification in a smartphone.
I could do that with these devices or I need a " Sonoff RF WiFi Wireless Smart Switch"?
you could do that with either. With the bridge you can turn notifications on and when one of the learned buttons/rf signals (up to four) get seen by the bridge the app will notify you.
Alternatively with a switch you could teach it ONE rf signal and eg. use IFTTT integration to trigger an email, phone call, notification.
In that regard the latter is more flexible, the bridge has no direct ifttt integration.