Renogy Firefly --20W Solar Power 16Ah Storage All-in-One Solar Kit with Additional 30-Watt Expansion Panel Ease of Use: Straightforward LCD display and various outputs for different devices. Versatile: Various outputs for different devices. It can charge any USB or AC appliance under 150W. Portable?Compact with a carrying handle, it was designed for mobile, off-grid applications. Emergency?Provides up to 175Wh of energy and includes an LED flashlight on the side with two modes, lighting and SOS. Upgrade: The Fireflys internal 10A charge controller allows for the addition of a 12V solar panel and includes a 5.5mm adaptor cable with DC to MC4 connectors to make expanding your system quick and easy.