iHome Portable Speaker for MP3 Players (Orange Neon) (Discontinued by Manufacturer) 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