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Dual USB Car Charger Adapter : Material:be made of Flame-retardant nylon Surface:With LED Digital Voltmeter And Dual USB and Rocker Switch Design Package include: 1*Dual USB Car Charger Adapter 2*terminals Function: Dual USB fast charging Wide range of application coverage The lid is waterproof and dustproof Wide Use Range: Universal for all 12V-24V cars,bus,trialer,boats,utv,atv,etc. Specification : input: 12-24V output: 5V/4.2A Protection of opposite connection: This product has reverse connection protection wiring instructions: The red line is connected to the positive terminal of the power supply, and the black line to the negative terminal of the power supply.