Car Cigarette Lighter Digital Voltmeter Dual 2 USB Charger Adapter LED Display Description:This USB car charger is used to charge phones， media players， GPS systems， or any other devices that come with a USB cable. This is one Car USB charger integrated with digital monitor for monitoring voltage. It can support charging two USB devices at a time. The voltage can indicate your car battery level and informs any necessity of replacement; the current gives you the charging efficiency. Features:Portable and convenient.Easy to operate and light weight.Dual USB， charge for 2 items at the same time.Ideal for charging iPad， iPhone， Samsung， Nokia， HTC， MP3， MP4 players， Sat Nav， Digital cameras and various other USB powered devices. Specifications:1. Input voltage:DC 12 V2. Output voltage: DC 5V3. Output current: 3.1A4. Colour: Blue， Red5 Dimension: approx. 50x26x26mm(1.96x1.0x1.0Inch) Package includes:1 x Car Charger More detail: