SONY SRS-T57 Personal Travel Speakers (Discontinued by Manufacturer) Compact, lightweight, foldable design makes for easy toting on trips Designed with separation between speaker cabinets for optimal stereo sound Mega Bass powers a full low end at any volume level Neodymium magnets produce high energy, accurate speaker output 2-way power allows use with 4 optional AA batteries or by plugging in with optional AC-E60HG AC adapter