this is all i need or do i need to buy something else in order to use it?
Hello Sergio, not you would need to get a back plate: http://www.scuba.com/scuba-gear-5/004593/ScubaPro-X-Tek-Scuba-BC-Backplate.html. Also you would need the harness system: http://www.scuba.com/scuba-gear-5/004641-004593-004598/ScubaPro-X-Tek-Form-Tek-BC-Harness-with-Stainless-Steel-Backplate.html. Putting these three systems together would make this a BCD.
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