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good, extended, great and better.
It have a very positive locking mechanism and the phone is 100% secure once inside
The only items in functionality i think it is worth mentioning: 1) when connected to a charger thru the extended battery pack, it will charge the phone battery to 100% then the extended battery pack
2) when you want to have the extended battery charge the phone you just need to touch the button on the back of the battery pack
Once the phone battery hits 100% it stops charging the phone until you touch the button again