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Model: RM-S578 Material:ABS+Metal Wireless Version: 5.0 TF Card: Support up to 32GB Transmisstion Distance: >10M Impedance:40 Output Power:2*3.5W S/N: 90dB Distortion: <1% Frequency: 120Hz-20kHz Interface: TYPE-C charging port, AUX, TF card slot