1、One key switch, convenient and quick 2、Cigarette lighter socket with seal cover, dust-proof and waterproof 3、Double USB charge slot total 3.1A can charge for mobile phone, Tablet, MP3 Player and so on 4、Voltmeter can real-time monitor your vehicle's voltage from 6V to 30V, convenient and safe 5、Environmental protection and flame-resistant materials, durable and corrosion resistant Features: One key switch, convenient and quick. Cigarette lighter socket with seal cover, dust-proof and waterproof. Double USB charg e slot total 3.1A can charge for mobile phone, Tablet, MP3 Player and so on. Environmental protection and flame-resistant materials, durable and corrosion resistant. Universal fit for 12V cars, RV, caravans, trailers, boats, yachts, marine etc. Specifications: Material: Environmental Protection Flame Retardant Nylon Material Color: Black + Red Output: 16A 12V DC Product Configuration: Circuit Breaker x1, Power Socket x1, Dual USB Socket x1, Voltmeter x1, Stainless Steel Screw x2 Voltmeter Range: 5-30V Dual USB Socket: Output: 5V 1A, 5V 2.1A Dual USB Socket Indicator Light: Red Product Size: 187 x 50 x 40.8mm/7.4" x 2" x 1.6" Mounting Hole Size: 166 x 48 x 40mm/6.5" x 1.9" x 1.57" Package Weight: approx. 180g Package Included: 1 x Power Socket 2 x Screws