The Power Bar is an indication of your endurance and performance level. It materializes the energy that was used live, during your training. It is your real-time available energy gauge.
It is strongly recommended to wash your clicshirt by hand (of course with the Cardiopod removed). If your clicshirt was accidentally put in the washing machine it would still work, but it is not recommended to do so in order to optimize its life span.
Your Bluetooth will be essential to the operation of your application in order to send the information to your mobile. Geolocation will allow you to find your routes and your altitude differences etc.... It will not be mandatory for all that.