CHGeek Dual USB Charger Socket Power Outlet Waterproof Marine 2.1A & 2.1A (4.2A) with Voltmeter LED Digital Display for 12V/24V Car RV Boat Motorcycle Mobile (2.1A&2.1A)

CHGeek Dual USB Charger Socket Bulit-in dual USB Fast Charging Technology. Two ports output 5V/2.1A&2.1A (total 4.2A), that's enough to charge two devices simultaneously! Multifunctional Blue LED Display It's a voltmeter, display the voltage of vehicle's battery. Let you always monitoring the health of battery and peace of mind when drive; It's a subtle blue light, allows you easy find the device in dark; Moreover, it also can check whether the connection is successful. Considerate Design ChGeek USB Socket charger add a USB Cap specifically. You can not only reading the voltage but also keep the dust out when the cover down. Really a good companion for your Car, RV, Boat, Marine or Motorcycle. Overcharge Protection Meets CE/ROHS certification, charges safely, without risk of overheating or damaging devices.  Splash-proof & High Safety Standard Material With splashproof cover, allows it do good job on boat! Adopted PA66 environment-friendly nylon material, high temperature resistant, low temperature resistant, also has anti-flame-retardant properties, makes it a high safety standard product. Product Features: Power Input: DC 12V-24V USB Output Voltage: 5V Output Current: 4.2A ( 2.1A&2.1A) MAX Power: 21W Product Dimension: 5.4cm x 3.7cm (2.12in x 1.46in) Portiforium Dimension: 2.9cm (1.14in) Package Include: 1* Dual Ports USB Charger 1* 23.7 Inches Wire with 10A fuse 2* Blue Terminal    NOTE: ???1. The voltage reading will be visible only by connecting to the battery 2. The voltage also can be read when the cover is engaged 3. This USB charger socket does not support Qualcomm quick charge Warranty:  60 days money-back and 12-month worry-free Guarantee!