Small Mini Guitar Amplifier MP3 Input HeadphonesSpecifications:��Mp3 input jack:3.5mm��Earphone input jack:3.5mm��Power by AAA battery��Material: ABS Plastic��Weight:54g(with the clamshell)��Power indicator��Dimension:89(L)��77(W)��26(H)mmSound Effect: LeadPackage included:1pc-Small Mini Guitar Amplifier MP3 Input Headphones-Lead