BlueFire 2.1A & 2.1A Waterproof Car Motorcycle Boat Marine ATV RV USB Charger Phone Charger Power Supply Socket with Dual USB Port and Voltmeter Red Light Fits 12V-24V Car Motorcycle Boat Marine ATV RV, Great for charging your Phones, Tablet, Android Devices, PDA, GPS ect LED Voltmeter Display, Prevent battery from high/low voltage uses High and Low Temperature Resistant Nylon Flame Retardant Materials, working temperature from -20 Celsius Degree to 90 Celsius Degree IP66 Waterproof, Full Competence for Outdoor Usage Pass CE Certificate.