Harman Kardon Omni 10 Compact Portable Bluetooth HD Wireless Audio Stream, Multi-room Streaming powered speaker System (Certified Refurbished) Premium Harman Karden Design Bluetooth Wireless Connection Built-in rechargeable battery upto 5 hours playtime and gives you the convince of playing music anywhere at your home deep bass from dual passive radiators Amazing audio performance delivering authentic sound. Technical specification: 4x15w Frequency response60hz-20khz