Features: Brand new and large quantity. DIY Design-Each port of this charger socket can be replaced with other ports, and can also be replaced with extra USB sockets or anything else that fits. Do it yourself, whatever you want. Wide Compatibility-This 4-in-1 charger socket panel is widely used in 6-30V cars, trucks, motorcycles, RV, ATV, boats, RVs, etc. USB socket port fits to charge ipad, iphone, ipod, HTC, Galaxy, Blackberry, MP3 players, digital cameras, pda devices and mobile phones. The LED digital display looks cool, especially in the dark. Overcharge Protection-Displays the current detected by the intelligent circuit during charging. Intelligent circuit design protects against over-current, overheating and overcharging. Ensure charging safety. Driving Safety-LED Voltmeter shows the voltage of 6-30V when driving, which can remind you whether the voltage is at normal level, ensure the safety of driving. Specification: Material: ABS Suitable: universal car, boat, truck Color: blue/green/red Weight: 152g USB socket output: DC 5V/4.2a Power strip: DC 12V Display range for voltmeter: 6 - 30V. Size: see picture Package Included: 1 x 1 x 12V Digital Voltmeter Cigarette Socket 1 x Power Socket Dual USB 1 x ON-OFF Toggle Switch 1 x Four Hole Panel 4 x Steel Screw 9 x Blue TerminalDear buyers, doc