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Product Specification:
• Driver Unit: ø40mm x 2
• Impedance: 32Ω
• Sensitvity:110±3dB  S.P.L at 1KHz
• Response (system): 20Hz~20KHz
• Rated Power: 20mW
• Power Supply: Lithium battery/DC 5V
• Built-in 400mAh rechargeable battery
• Plug Type: Micro USB
• Dimensions:  N/A
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