This Dual USB Rocker Switch Style Voltmeter charges two devices simultaneously while also displaying the batteries output. Fits into any 13/16? x 1-7/16? rocker switch hole. The total output 4.8A load is split 2.4A per side as needed. Protective dust cap extends the life of the charger. Constructed of injection molded nylon. 13/16" inches wide. Output DC 5V/4.8A. Input 12-24VDC. Red LED display. IP65 rating.