Charges Any 3 Portable Media Devices Simultaneously. Scd (smart Current Detection) Adjusts The Current Flow To Ensure Proper Charging To Each Device. Displays and Plays One Device On Doks Speaker System While Charging Another. Compatible With Any Smart Device. Plays A Device Through Its High-quality Speaker System. Clock Radio With Fm Stereo Wake Alarm Option. Compatible Cradle For Smartphones and Mp3 Players. Holds Up To 3 Devices While Charging In Cradles. Surge Protection Built-in. Tidy-cable Organizer Feature. Time, Alarm and Sleep Functions. Battery Backup For Power Outages. 4w Output Power. 110v and -240v and 50 Hz-60 Hz Ac Power Ul Approved