1. JW-02 features 4 channels, when several sets of JW-02 are being used simultaneously, you can choose different channels on your own to avoid interference. 2. If the red light flashes after you switch on the transmitter or the receiver, it indicates low battery, please charge it in time with the USB cable. 3. Easy to use, plug and play 4. Vniversal for all electric musical instrument 5. Not be influenced by external signals or phones
