AppAdvice has teamed up with iMobLife, our latest AppAdvice Daily podcast sponsor, in order to offer you a chance to win one of five promo codes for Brainwaves РThe Unexplainable Store ($0.99) for iPhone, iPod touch, and iPad.

Brainwaves – The Unexplainable Store is an audio app that serves as a meditation aid. It’s able to help you put your mind at ease and achieve an altered state of mind by having you listen to high quality isochronic tones.

The app includes a full10 minute brainwave session that will help you calm down and relax within mere moments. If you have had an extremely stressful day and feel as if you’re going to need more than a single session to calm down, you can set a timer to have it loop over and over.

There's something for everyone.

The app also includes a built-in store featuring more than 80 additional brainwave sessions. Sessions can be broken down by category to help you quickly find the perfect tone for whatever it is that ails you. Each one includes an introduction, brain state details, and the ability to preview up to one minute of the session. Additional sessions vary in price and duration, but most clock in at around 30 minutes and cost around $12.99.

All of Brainwaves’ more than 80 sessions were recorded at a 320 bitrate, resulting in the best possible quality of sound. Because of this, downloading additional sessions will take a short while, so just be patient. The app also includes separate user manuals for every session available in the built-in store.

To have a chance at winning one of two Brainwaves РThe Unexplainable Store promo codes, simply retweet this article before 11:59 p.m. PDT tomorrow (June 19). We will then search the Twitterverse for all of the retweets and randomly choose our lucky winners. The winners will be notified via Twitter, so please be sure to follow us so we can send you your promo code via a direct message.

Non-Twitter users and those of you who want to increase your odds of winning can leave a relevant comment below before 11:59 p.m. PDT tomorrow to have a chance at winning one of the other three promo codes.

Feel free to participate in the giveaway via either or both methods. Only one entry per person per method is allowed, totaling up to two entries per person if using both.