I really like the concept of a remote access to USB port and external input jack. Unfortunately the unit itself is plastic and the secure nuts are a rubber plastic and you can not get the plastic nuts tight enough to secure the unit in place permanently. Great concept but very poor design for a marine application. They should have used stainless steel and I would gladly have paid the extra money for a quality product rather than a weak flimsy design. It does work good for the audio connection but just wont stay in place due to the poor plastic hardware is not strong enough support the unit while boating.