B08MVXVHK1 CAROL BTH-830 Brown Bluetooth Wireless Headphone with Transmitter and Receiver

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Transducer Type: Dynamic, neodymium magnet
Dimension (L x W x H): 187 x 173.9 x 78.9 mm
Sensitivity: 118 ?? 3dBSPL (at 178mV 1KHz)
Frequency Response: 20Hz~20,000Hz
Charging Time and Power Duration: Chager 2 hours, and can use maximum 8 hours