Dual USB Power Plug with Voltage/Amp Meter 

LCD screen displays charging status in amps, battery voltage, and low voltage audio alarm. Stamped stainless steel and injection molded nylon construction this USB power plug adapter charges two devices simultaneously. Input 12-24V, Single output DC 5V/2.4A. Total output is a 4.8A with the load being split between the two sides as needed. Enough power to charge iPhones, iPads and most other devices. Can be used on a boat, car, or RV. This portable version fits all Sea-Dog® Power Sockets and any standard 12V receptacle.