Description:IPX7 waterproof ��120 ma batteries��Distance:10 mCharging time: 1-2 hours��Noise reduction: CVC6.0��Frequency:15 -25 KHZ��Impedance:16 ����The horn size: �� 8 mm��Sensitivity: 104 �� 3 dbWire control operation: YES (with the exclusive software can custom button function)��Other facilities: NFC touch links， switch songs