... USB HOST +micro SD Card Slot + MP4specifications: 1. Portable mini speaker support MP3, MP4, mobile phone, iPod , iPad , iPhone, PC, laptop, ... etc.2. Elegant portable metal case design3. 2pcs x 3W ... function selling points:1. 3.0 inch large LED display speaker 2. Aluminium alloy case3. built-in rechargeable lithium battery4. ...