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Extractme Motorcycle USB Charger SAE to USB Adapter Kit with Voltmeter and Power Switch Waterproof Motorcycle Dual USB Quick Charger for Smart Phone Tablet GPS Wiring Instructions Method 1: If your vehicle has a SAE socket, and the polarity is consistent with our product, directly connect and use it. Method 2: If your vehicle has a SAE socket, but the polarity is opposite with our product, please use the SAE reverse polarity adapter first, and then connect it. Method 3: When you want to directly connect the battery to use, just use the power extension cord provided by us.