4 gang 4.2a on/off toggle switch panel dual usb charger voltmeter for car boat truck blue

with waterproof design, suitable for indoor/outdoor or ocean use. built-in overload, over-current and short circuit protection, very safe to use. with waterproof and dust-proof cover, can protect the product when not in use. voltmeter with three digit led digital display, real time monitor the battery voltage. use on automotive electronic field, electrical devices, most car, motorcycle, truck, buses, suv, home, boat, camper/rv, atv, utv, golf cart, and more electrical devices..syi