At times you are in a state of shock and will prefer a thing that is going to keep you safe all of the time. You need to think about this because you are figuring out how you are going to remain as alert as possible.
The keychain alarm is important in this time period.
You need to take into consideration what you are using to protect yourself, and this will be the greatest alternative. It is easy to connect, and you will be able to stay safe.
I use it continuously, and it does a lot for me. You should have one for yourself too.