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9 inch （2018）
The USB connector has an output voltage of 5V and a current of 2A
2inch * 18
Bluetooth communication protocol: A2DP
High quality gadget make your life easily
For Mobile Phones & Tablets & Laptops, Support 32GB TF Card Maximum, B570 Color:Brown 9 inch （2018）1. Wired and wireless, hands free call, USB charging, Bluetooth signal, wireless card play. 2. Use LED display function to facilitate mode rotation and song switching. 3. Humanized removable battery design, standby battery can be replaced at any time, no power troubles. 4. Environment friendly rubber head beam, light and flexible. 5. Folding structure design, easy to carry and storage. Specification: General Model B570 Types Headset (with mic)