Patented retractable cables for easy travel Magnetic lock to secure speakers into one Standard 3.5 audio plug for easy plug and play Extendable resonance for powerful sound quality 6 Hours of Play Time Power Output: 4W Rechargeable Li-Polymer Battery Input: DC5V Speakers: 4 Ohm Dimension: 4” x 2” Patented Built-In RetractableCables Standard 3.5mm audio plug Works with all MP3 musicplayers, IPOD™, IPhone™ and Laptops