Bluetooth version: V4.1 + EDR Support: HFP, HSP, A2DP, AVRCP Buttons< B>: MFB, volume control, scrolling Dimensions: 106 * 91 * 30 mm Output voltage: 5v / 0.5-1.0A Music listening time: 4 hours Frequency: 20 Hz-20 KHz Sensitivity: -42 db ± 3 db Impedance< B>: 16 OM
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