Specifications : Material: PC Color: Black Size: 1.5*2.37 inch Compatibility: Universal Fit Please Attention: 1. The charger will certainly be hot during working. In the normal room temperature, it is normal if it does not exceed 60?. 2. Protects devices from overheated and over-currents, overcharging, and short circuits, charging will be automatically stopped when the battery is full. 3. Please do not strongly hit the portable car charger. 4. Do not immerse it in water. 5. Do not transform or decompose this product. 6. Avoiding to charge in high temperature or under sunlight, the high temperature will affect the charging.?Vast Compatibility?: Fits for DC 12/24V car, boat, marine, motorcycle, ATV, RV, etc. This USB charger for cars are suitable for charging most smart phones, power banks, video game controllers, sports watches, etc. It also compatible with various models of cigarette lighters, including family cars, business SUVs, off-road sports cars, etc. ?Safe & Reliable?: Protects devices from overheated and over-currents, overcharging, and short circuits, charging will be automatically stopped when the battery is full. ABS + PC fireproof material, with the confirmed connection by LED Indicator Blue Light, you can make sure your digital devices are always charged. ?LED Voltmeter Display?: Features a blue LED voltmeter. The USB socket automatically monitors the vehicle's battery and the electrical system and indicates the car voltage on the screen. Our 4 USB charger socket will let you know the battery's health while driving. ?Voltage Detection?: Car cigarette lighter adapter with LED digital display voltage meter, you can monitor and display the voltage of the car battery in real time, to master the health of the car's electrical system, let you take timely measures to avoid possible breakdowns during driving. Help you drive safely and discharge safety hazards. ?4 Ports USB Car Charger?: The 4-port car charger comes with PD 2.4A USB C port, tailored for fast charging for phones, with 30W power, far exceeding the charging efficiency of the original charger. And QC 3.0, USB ports, compatible with most mainstream cell phone fast charging, can charge 4 devices simultaneously charging, gets to 50% charge in <30 minutes, to achieve real stability and speed.