Double XP Advisor is an app which allows you to know the double XP weekend dates.

This app will send you a notification with all the info about when can you increase your experience points, weapon levels, zombies experience, Cryptokey and more.

You can download this app at the Android Market for all the Android versions.

LET'S PLAY!! An un-official app for black ops 3 - 2xp - 2px - 2 px - doble - xp calendar #2XPWeekend #2XWeaponXP #2XWeapon

This is just a Double XP Advisor, not a booster. It also includes a calendar / Follow the call of duty un-official / Double XP Calendar for black ops 3.
This is an un-official app for BO3.