Features: 1.3 in 1 multi?function cigarette lighter socket, can be car charger, voltmeter, power adapter. With double USB output, it can supply power to 2 devices at the same time. 2.This volt meter gauge helps user monitor the battery situation for driving safety. 3.The switch with overload protection can protect the circuit. When the circuit current is greater than 16A, the switch will be automatically disconnected without damaging the equipment. 4.Strong applicability, suitable for most 12?24V cars, off?road vehicles, RVs, buses and other models on the market. 5.The switch has an indicator light which supports quickly identify whether the circuit is open or whether the circuit is safe. 6.Good compatibility, suitable for high power equipment such as car USB, driving recorder, GPS, car charger, car vacuum cleaner, car refrigerator, etc. Specification: Conditon: 100% Brand New Item Type: Cigar Lighter Adapter Material: ABS Color: As Pictures Shown Adapter Size: Approx. 131.3 x 41 x 52.3mm/5.2 x 1.6 x 2.1in Line Length: Approx. 92cm/36.2in Screw Hole Spacing: Approx. 122mm/4.8in Screw Hole Diameter: Approx. 4.2mm/0.2in Input Voltage: DC12-24V Product Current: Input 16A Product Wire Gauge: 18AWG Connection Method: Red Wire to Positive Pole, Black Wire to Negative Pole Installation Method: Screw Fixed Power Adapter Base: Input Voltage: DC12-24V Hole Inside Diameter: Approx. 21mm/0.8in Compatible with Most Car Equipment such as Driving Recorder, USB Car Charger, GPS, etc. Voltmeter: Input Voltage: DC12-24V Pressure Measurement Range: 2.5-30V USB: Output: 5V 3.1A (up 2.1A+down 1A) Dual-Port Output: Can Charge 2 Devices at The Same Time for the Main and Co-Pilot Strong Compatibility: Compatible with most digital devices such as Mobile Phones, Tablets, and MP3 on the Market PackageList: 1 x Adapter2 x Screw