Lcd Screen Displays Charging Status In Amps Battery Voltage And Low Voltage Audio Alarm.Stamped Stainless Steel And Injection Molded Nylon Construction.This Usb Power Plug Adapter Charges Two Devices Simultaneously.Input 12-24V Single Output Dc 5V/2.1A.Total Output Is A 4.2A With The Load Being Split Between The Two Sides As Needed.Enough Power To Charge Iphones Ipads And Most Other Devices.Can Be Used On A Boat In A Car Or Rv.This Portable Version Fits All Sea-Dog® Power Sockets And Any Standard 12V Receptacle.