Dabus2 is a free and convenient mobile app for catching a bus on Oahu. It is the replacement for the previous DaBus app, and can be used on Android devices. It is very easy to use, and all you need is to install it on your device and follow the prompts to start using it. It will track the locations of the buses on Oahu, and when you use it, it will tell you when the next bus will arrive at the stop that you are at. It is a fun and easy-to-use app, and you don't need to worry about paying a penny to use it.