Three Hole Tent Car DC Volt Digital Voltmeter DC12V Power Socket Dual USB 2 Port 1. 2 port USB Socket,Waterproof Design, 2. Power Input: DC 12V-24V, USB Socket I Power Output: DC 5V 1A, USB Socket II Power Output: DC 5V 2.1A, Output: 5V 3.1A DC(Total) 3. 2 pole nickel plated brass terminal connectors 4. Twist-and-Lock system, allows a suitable power plug (not included) to lock into place 5. Suitable for a variety of applications including: Marine cockpits, caravan applications, trucks, 4x4s and RV's