Will Warm You & Let Enjoy Music or Conversation When You Are Out. Model Can be Used Also as Clutch for Hands. Built-in Microphone Transmits Talking Phone to Your Audio Devices Directly & Provides Hands-free Answering. Built-in Li-ion Chargeable Battery, Charge Via USB Cable, Long Stand-by Time. Model is Designed So That You Can Take Bluetooth & Put It Back, So Hat is Easily Washed & Reused. Minimum Quantity: 200.