... 76 -108MHZ4, Excellent tone quality, with wallyson dual channel stereo.5, Dual power supply, built-in rechargeable lithium battery and ... 2.4Frequency range: 80HZ-20KHZImpedance: 4Power Voltage: USB / DC 5.0 VAccessory : Audio cable ,USB cable, lanyard , lithium battery ... 76 -108MHZ4, Excellent tone quality, with wallyson dual channel stereo.5, Dual power supply, built-in rechargeable lithium battery and ...