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_x000D_ Item Type: Cigar Lighter Adapter_x000D_ Material: ABS_x000D_ Color: As Pictures Shown_x000D_ Adapter Size: Approx. 131.3 x 41 x 52.3mm/5.2 x 1.6 x 2.1in_x000D_ Line Length: Approx. 92cm/36.2in_x000D_ Screw Hole Spacing: Approx. 122mm/4.8in_x000D_ Screw Hole Diameter: Approx. 4.2mm/0.2in_x000D_ Input Voltage: DC12-24V_x000D_ Product Current: Input 16A_x000D_ Product Wire Gauge: 18AWG_x000D_ Connection Method: Red Wire to Positive Pole, Black Wire to Negative Pole_x000D_ Installation Method: Screw Fixed_x000D_ Power Adapter Base:_x000D_ Input Voltage: DC12-24V_x000D_ Hole Inside Diameter: Approx. 21mm/0.8in_x000D_ Compatible with Most Car Equipment such as Driving Recorder, USB Car Charger, GPS, etc._x000D_ Voltmeter:_x000D_ _x000D_ Input Voltage: DC12-24V_x000D_ Pressure Measurement Range: 2.5-30V_x000D_ USB:_x000D_ Output: 5V 3.1A (up 2.1A+down 1A)_x000D_ Dual-Port Output: Can Charge 2 Devices at The Same Time for the Main and Co-Pilot_x000D_ Strong Compatibility: Compatible with most digital devices such as Mobile Phones, Tablets, and MP3 on the Market PackageList: 1 x Adapter2 x Screw