Sound Dock Station for iPhone,iPod,mp3 Players and All Mobile Devices Plug and play - 3.5 mm jack plug (same as any common headphones) Plays iPad, iPhone. IPod and other MP3 players (built in audio cable fits headphone jack on any audio device) Space- saving flat shape with retractable stand to support all iPhone, iPod, iPad models Stereo 2.1 speakers & Exb circuitry for great sound, SNR: &gt;85dB , Frequency: 20Hz-20Khz Operates 4xAA batteries OR USB power supply - Batteries not included