12v Voltmeter Socket - Flush Mount Motorcycle, ATV, Boat, RV, USB Weatherproof Power Socket - USB Charger (optional SAE to USB) Direct connect to 12 VDC system (Input voltage is DC 12V +/-4) Powers down to USB power requirements (DC 5V +/-0.25 and 2.1A max) Heavy Duty All Weather Design with Zippo Cap Design. Water Resistant, not water immersible Easy to open and use