iHome 3.5mm Aux Portable Speaker (Purple Translucent) Speaker works with any 3.5 mm headphone jack, perfect for laptops, phones, portable game devices, MP3 players, etc. Size defying sound - Vacuum bass design provides surprising volume and bass response in a small space-saving speaker that fits in your hand Built-in rechargeable battery - Long-lasting rechargeable internal lithium ion battery Collapsible speaker can be used singly or get two for simulated stereo - Twist speaker to expand Use two for simulated stereo or a single speaker for mono