Blue Sea Systems 12V DC USB 2.0 Extension with Cable

The Blue Sea Systems 12V DC USB Extension solves a common wiring headache: a stereo or head unit mounted in a cabin or below-deck location, with its USB port out of reach for anyone standing at the helm. This extension brings a genuine USB 2.0 data connection up to the dash on a 5-foot prewired cable.

Key features

• USB 2.0 data/voltage port, 5ft (1.52m) prewired cable
• Plugs directly into the stereo's USB port — no adapter needed
• Mounts in a common 1-1/8" hole
• Protective dust cap with tether keeps out dust and spray
• IP45 rated with the cover closed
• Simple, purpose-built solution rather than a generic USB extension cable

Once installed, anyone at the dash can plug a phone or tablet into this extension to control the cabin stereo directly, or to charge and play music from a USB drive without climbing below to reach the head unit itself.

This is a genuine data-carrying USB extension, not just a power port — it's built specifically to relay the stereo's USB signal, so confirm your head unit has a rear or panel-mount USB input designed to accept this kind of remote extension before installing. Route the 5ft cable along an accessible path so it isn't strained or pinched when panels are removed for other maintenance. A short excess length is normal — coil it neatly behind the panel rather than trimming the cable, since a shortened cable can't be easily extended again later if the mounting location changes down the road.