T Tocas(tm) Car Motorcycle ATV Dc Digital Voltmeter+ dual USB 2 Ports + dc12v Cigarette Lighter Integrated, for Phone GPS Power Socket Charger 2 Port USB Socket Charger DC Voltmeter:Measure voltage: 6 - 30V DC12V Power Cigarette Socket Meterial: Environmental protection engineering plastic shell Range of application: Cars, motorcycles and other universal models