These Pyle mini-speakers pack an enormous punch in a miniscule package. Your ears won't believe your eyes when you hear them. This speaker may look small, but it expands with a unique vacuum bass design for surprising volume and response. It'll hook up easily to any MP3 player, iPod, iPhone, or even your laptop - anything with a 3.5mm jack. Plus, you can chain up multiple speakers using a connecting wire to make the sound even louder and really get the party going. The built-in lithium rechargeable batteries will let you play music for up to 4 hours and charge via USB. Delivers high quality audio from 280 Hz to 16 kHz. Includes USB and 3.5mm cable.