Grandmax Mini Tweakers Portable Palm-Size Speakers for iPod / Mp3 Players & Laptops (White) iPod / mp3 Players & Laptops Frequency tunes amplifier delivers crystal clear sound. With 3.5mm audio plug, connects to iPod, iPhone and most popular audio devices. Built-in lithium polymer rechargeable battery, simply recharge through any standard USB port with included audio/charge cable. Decorative LED light rim with charging status indication.