Bullet points:1. With a red/green LED digital voltmeter, it can easily monitor the battery voltage, with reverse connection protection, and no wire burn.2. Simple, compact and elegant design. Environmentally friendly ABS material. Dual-port car charger with voltmeter is the best choice for your mobile devices and car batteries.3. Easy to use and install. Overheating, over-current, over-charge protection, when the device battery is fully charged, it can automatically stop charging.4. Compatible devices: compatible for iPhone 6 6S Plus, iPad Pro, Air Mini, Samsung Galaxy S6 Edge and other mobile phones.5. The compact design and practical functions are very suitable for daily travel and easy to use.Descriptions:1. Dual USB ports, suitable for all USB 2.0 charging mobile phones or other electronic products.2. Blue digital voltmeter for easy monitoring of battery voltage.3. Flame retardant, high-temperature resistance, corrosion resistance and not easy to deform. Fast charging, multiple protection, CE certified quality, trustworthy.4. Waterproof and dustproof, safer to use. High-current dual USB car charger with large capacity.Specification:Size (length * width * height): 1.97*0.96*1.97 inches (approximately)Installation size (length * width): 1.47" x 0.84" (approximately) for most carsBody color: black (pictured)Power input: DC 12V-24VUSB socket power output: DC 5V 4.2AVoltmeter display color: red/greenNet weight: 0.04 pounds (approximately)Package included:1*USB charger digital display voltmeter2*14CM cableNotes:1. The actual color of the product may be slightly different from the website picture due to various factors such as