To the products:
Accumulator
Who is in the situation that his old battery by holding no more long and constantly needs to be reloaded, can find a really great replacement battery. My battery lasts in normal use of the iPhone (calls, WhatsApp and Facebook, no games!) Loose one day through.
That there can be no original battery, all will be clear with a normal sense.
Tool
The tool is indispensable part for the exchange of the battery. However, one should not use the battery for raushebeln the plastic lever. The batteries are so tightly bonded that would ensure in most cases break the lever.
To levers So rather just take a screwdriver.
Otherwise, as much as you need tools for exchange and as good as you could expect for 12 total price of the quality.
All in all from me a clear recommendation!