XYZ Boat Supplies Brand Tent with Dual USB Charger Socket with Voltmeter for Boat/Rv/Car/Motor-home - External Mount 2 USB Socket port , Waterproof Design Power Input: DC 12V USB Socket 1 Power Output: DC 5V 2.1A USB Socket 2 Power Output: DC 5V 1A 1 x DC Voltmeter Digital