Dual QC3.0 USB Ports hardness, heat sink, corrosion resistance, high temperature exposure resistance This product has Reverse Connection Protection Support most mobile phones, tablet charging, and vehicle electrical appliances. Most vehicles with working voltage of 12V-24V can be installed and used. Item Type: Car dual USB 3.0 fast charge charger Display voltmeter color: red Application: for Feature1: Voltmeter Feature2: Charging socket Colour:black Material:plastic Package Contents: 1 x Car Charger 1 x wire harness Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.