In some cases you are in a state of panic and will need something that is going to protect you at all times. You have to think about this since you are figuring out how you are going to remain as alert as you can be.
The keychain alarm is a must in this day and age.
You must think of what you are utilizing to safeguard yourself, and this would be the ultimate option. It is easy to connect, and you will be able to stay safe.
I utilize it all the time, and it does a great deal for me. You should have one of your own also.