4 in 1 New Digital Voltmeter 12V Power Socket Dual USB Charger Adapter Cigarette Lighter Socket with Rocker Switch——12V Digital Voltmeter Power Socket Dual USB Charger Cigarette Lighter Socket with Rocker Switch Description:1. DIY four holes panel base: cigarette lighter socket plug voltage indicator dual USB two position switch. Small size and excellent performance. Easy to install, convenient to use. Universal fits 12V vehicle, motorcycle, ATV, boat, car or ship.2. The dual USB output design allows you to charge 2 USB devices at the same time to save time. Ensure safe charging.4. Two-position switch: easy to control and with red light to remind people when turned on. Multifunctional product, perfect for on-the-go use.5 With many protection functions: built-in identification resistor, reverse polarity, overcurrent protection, over-temperature protection, short circuit protection.