Blue Sea Systems Dual USB Charger Socket The Blue Sea Systems Dual USB Charger Socket allows you to charge two mobile devices on the go. This charger socket is made with corrosion resistant materials, which ensures a solid contact and low voltage drop. Features a protective dust cap with tether that protects the charger from dust and spray. Easy to install, this socket fits in the same mounting hole as a traditional 12 volt outlet. Features Fits in same mounting hole as traditional 12 Volt outle