U.S. Solid Marine Grade Triple Panel Cigarette Lighter Socket Plug Outlet, Dual USB Charger Outlet, and Digital Display Voltmeter DC 12V Compatible with any standard USB cable charger, lighter plug, or lockable marine plug. The Dual USB Charger Outlets will charge two devices simultaneously and is designed for rapid charging. The Dual USB Charger Outlets will charge two devices simultaneously and is designed for rapid charging. The outputs for the USB ports are DC 5V 1A and DC 5V 2.1A. The Digital Display Voltmeter is used to measure the voltage between two points in an electrical circuit; between DC 4-24V. CAUTION: This Cigarette Lighter Socket Plug Outlet, Dual USB Charger Outlet, and Digital Display Voltmeter are designed for DC 12V use and should NOT be plugged into an outlet in your home. Also, this Cigarette Lighter Socket Plug Outlet is NOT used for actual hot lighters. DESIGN: It is marine grade which means it can be used in marine environments. It is weather and UV resistant. This triple panel is designed with heavy-duty nylon plastic and nickel-plated brass terminals. The power socket contains an interlocking system that securely locks the plugs into the outlet resulting in a secure and waterproof connection. EASY INSTALLATION: The USS-WMB00004 requires three 1 1/8" holes approx. 3/4 apart for mounting and has quick male-ended connectors. The socket mounts with a retaining nut against a panel and uses standard 0.250 quick connects. (SCREW SET INCLUDED)