iKross Red 3.5mm Portable Mini Stereo Speakers for Amazon New Kindle Fire HD 7" / HDX 7", Kindle Fire HDX 8.9" New Kindle Paperwhite, Kindle Fire HD 7/8.9 inch Tab, Kindle Paperwhite Compatible with all Devices with Standard 3.5mm audio jack PumpBass technology: small size, big bass and volume Maximum play time up to 8 hours. Patented built-in retractable cable Portable style. Dimensions: (W) 53 x (D) 53 x (H) 98cm Power output: 4W. Speaker: D36mm. Li-Polymer battery input: 5V DC/430mAh