Innovative audio backpack 1. MCMA technology (Multi Cell Microtransducer Array Technology) Other than traditional speaker spreads the sound of music orderless to the air, our flat panel speaker applies MCMA technology, which concentrates the sound horizontally and forwardly. Therefore the sound of music can be completely transmitted to the user’s ear. 2. Water resistant flat panel speaker. Most of audio backpacks are water resistant in backpacks, but NOT in the speakers; however, our speakers are water resistant and around IP3~4 level. 3. Our audio backpacks are light-weighted. There are only around 300g including 4 x AA batteries. 4. Other than the traditional controller must be replaced a whole new one once a part is damaged, our controller is modular, therefore once a part is damaged, you only need to replace the damaged part by a new spare part instead of replacing a whole new controller. 5. The traditional controller is put in the backpack and users must take out the sound-source if they want to control the volume or check the power supply. Instead of that, our remote controller is set just on the backbelt so the users can easily control the volume and check the power supply. 6. Backpack can be specially designed to meet all kinds of requirement. 7. OEM is available. CE/FCC certification should be approved in May.