KAIDAER 3 watts Mini Portable Speaker for IPhone, IPad, MP3 and Computers Mini Speaker Aluminum Black Frame- 3 Watts Speaker No Battery Needed. Portable Battery Re-chargeable built inside. Charge by USB Awesome sound for a Mini Speaker. Works on any devise with audio headjack. Plays on Iphone, MP3, computer etc.. Built in SD Card Reader Handsome Sound Quality and Clarity - All Functional Keys plus EQ