A typical American Power Adapter to charge your Firefly at home, in the car or any places that can connect to a computer. This power adapter can provide an efficient charging , which wonderfully match the Firefly-RK3288. Specifications: Rated Input: 100-240VAC~50/60Hz Rated Output:5V-2.5A Certifications:FC、CE compliant Working Temperature: 0-40℃, Fully loaded, Function Well Operating Humidity: 5%（0℃） ~ 95%（40℃） Size:L39 X W27 X H43 Weight:47g If you have any questions, feel free to send us an email to service(at)t-firefly.com. For any technical support or suggestion, please kindly go to our forum.