... , ROHS, etc. 4.portable vibration speaker 5.Made of aluminum Detailed Product Description1.USB vibration speaker2.support PC,MP3,MP4,CD ... ,DVD ,Mobile phone,etc 3.support USB,Micro SD ... strong penetrability5.less attenuation MAKE THE OTHER SPEKAERS FEEBLENESSOur Quality Quality management——three CAN’T PASS1.Bad product are not ...