YooMee Black BEAT51 Portable Travel-size Mini Speaker for Apple iPhone 4g, iPad, iPod Touch, Other MP3 Players, Cellular Phones, PC Computers, and Tablet PC (Black) YooMee BEAT51 portable mini speaker is lightweight (just 2.2 ounces) and designed with a built-in amplifier (with a rating power of 2W with amplifier) for unbelievably powerful sound! The speaker can be charged while music is playing. Speaker contains a high quality 400mAH Lithium battery that can play up to 48 hours of continuous playback at medium volume one full charge. Speaker is compatible with all standard USB chargers (Car, Mains, PC) and all 3.5mm jack audio players. Easy and convenient, just plug to charge (using standard USB plug) and play (using 3.5mm audio jack). The length of a full charge is around 3 hours at a charging voltage of 5V. You can connect your YooMee portable mini speaker to your games console, laptop, MP3 player, Apple iPhone, iPod Touch, iPad & other electronic devices for a great indoors and outdoors experience! Vertekspeakers is a co-brand of YooMee Inc. Available colors: rubberized red, rubberized black