Marware UpSurge Rechargeable Mini Speaker with 3.5mm Headphone/Audio Jack, Silver Perfect portable, rechargable solution to enjoy your Kindle Fire content on the go Speaker also works with virtually any media playing device with a 3.5mm headphone jack - perfect for mobile phones, laptops, tablets, portable gaming devices and MP3 players Vacuum bass expansion system and digital amplifier enhance sound quality Weighs 5.1 oz/DC-5V charge/Built-in Lithium-ion rechargeable battery (3.7V 500mA) Play time: 5 hours