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

CHGeek Dual USB Charger Socket Multifunctional Blue LED Display It's a subtle blue light, allows you easy find the device in dark; Moreover, it also can check whether the connection is successful. Smart IC Technology With intelligent power IC, outputs stable current without fluctuation. Product Features: Power Input: DC 12V-24V USB Output Voltage: 5V Output Current: 4.2A ( 2.1A&2.1A) MAX Power: 21W How to Install: Drill a hole with 3cm diameter by hole opener. Put the socket in. Screw it tightly. The terminals on the back are labled with "+" and "-"for positive and negative poles. Notes: The voltage ONLY can be shown when connecting the car charger to power and switching on the button. Please cover outlets when not in use to aviod dust and water entering.