... with touch buttonWith touch buttonsBuilt-in 2.4GHz wireless receiver. Frequency range:2400~2483MHZ,Group supported: 2414,2432,2468,2450Distance:100m ( barrier ... with Digital Screen(WM-121D)Reception capability:-87dBmDemodulation Mode: FMReceiving Frequency Range: 2400~2483MHZRange: 100mFrequency Group Supported: 2414,2432, 2468,2450Audio output ...