... Hamburger Mini Speaker / MP3 speaker HS-100 1.USB rechargeable battery 2.Hot MP3 speaker 3.Phone mini speaker Hamburger Mini ... Speaker / MP3 speaker HS-100 Mini speaker with rechargeable battery, hamburger mini speaker, x mini speaker, mp3 speaker Product Details ... more clear, the bass more pure and stronger5) Embedded type lithium battery, can use USB or power adapter for charge, more convenient ...