Meet the Openmix: one of the smallest audio mixers we have seen. There are no batteries to deal with. Just connect your audio device and plug in a speaker to the output. The Openmix allows you to mix and switch between your audio sources. There is an additional input for you to use to apply your audio effects. The small audio crossfader lets you mix back and forth between two tracks or create transitions from one song to the other.
The Openmix mixer is so small, you are not going to have a hard time carrying it with you. The fact that it does not have a battery makes life more convenient. To put focus on quality, the developers have used gold plated connectors and a customized high quality crossfader. The device measures 1.5 x 2 x 0.6 in and weighs 0.6 oz. This awesome tool is on Kickstarter right now.