Can be widely used for ad and mobile phone, , driving charging, etc.Car modification USB charging, 12V-24V incoming line, two USB ports out, one 1A, one 2.1A.Input: 12-24V DC.Output: MaximuA 5V DC/2 USB ports, dual USB ports for mobile phones, MP3s, etc.There is a point + - at the bottom of the product. Please look clearly when wiring. Do not re the connection. If the product is red, it will out.Features:1. Strong performance, equped with smart field, high output voltage and current accuracy, fast response speed, ligent identification, more stable and safe.2. Apply to all mobile phone brands, tablets, car s, electronic dog, and other electronic equments, eliminate the critical moment of power embarrament.3. Apply for small cars, off-road vehicles and small trucks (not more than 24V), yachts, motorcycles, shs. (Most of the trucks, excavators, trucks, battery voltage is actually more than 48V, so do not recommended to use in this type of cars)e sure your car is 12-24V voltageNote: This product is not , can not light the arette. Can not exchange positive and negative poles, so as not to your electronic products!USB interface: 2 x USB 2.0 interfaceOutput current: 3.1A (2.1A + 2.1A)Voltage range: 6-28vProduct size: 5.5 x 3.6cmSpecifications:Colour: BlackMaterial: Nylonlight Color: greenPower supply: 12V DCWorking current: 3 AWaterproof function: Yes (life waterproof)Mounting hole diameter: 2.9cm, wide nut fixingWiring leg width: 6.3MM (send terminal)Packing include:2 x Car USB mobile phone charger voltmete2 x 60CM cable2 x blue connection capOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the ture a little different from the real thing. The measurement allowed error is +/- 1-3cm.