The Micro Tracker has two models including the GL 200 and the GL 300. The GL 200 is actually a better product and has a longer battery life. The GL 200 is accurate and can last for up to two and a half weeks. The GL 300′s battery isn’t as powerful and will last for about a few days. Both devices are water resistant and have a motion sensor. They are very similar products, but the main area of difference is the battery life. The GL 200 is designed to last longer and is even smaller than the GL 300.