Pyle Home PMS7B 3.5mm Aux Portable Speaker (Black) Works With All iPod/iPhone Models And Other Audio Devices With 3.5mm Audio Jack - Built In Li-Ion Rechargeable Batteries - Lasts Up To 4 Hours - Color: Black Daisy-Chain Multiple Speakers Together For A Huge Sound - Frequency Response: 280 Hz - 16 kHz Perfect Replacement For Laptop Speakers - Battery Charge Time: DC 5V 200MAH-300 MAH Around 2.5 Hours; USB 4 Hours Unique Vacuum Bass Design For Surprising Volume And Bass Response - Power Output: 10 Watts Fits In Your Hand Or Pocket For Ultimate Portability - Dimensions: 3.03'' x 2.18'' x 1.49''