+How do I switch channels/frequencies?

  ǒ The guitar system has 20 adjustable frequencies. You can press the FREQ+ and the FREQ- button to adjust the frequency.

+can i use this to make mic wireless? (plug one end to mic and outer to speaker?)

  ǒ No, this is for instruments not microphones. If you need a wireless mic, look up "wireless mic"

+If I use two sets of these, will the signals get mixed up?

  ǒ If you want to use them at the same time, please set them at different frequencies. The guitar system has 20 adjustable frequencies. As long as they do not interference with each other the signals will not get mixed up. You can press the FREQ+ and the FREQ- button to adjust the frequency.

+Can the transmitter connect with my Bluetooth headphones?

  ǒ Nope, you cannot connect the transmitter with your bluetooth headphones.

+When will I know they are recharged?

  ǒ When the G12 is charging, the power light is red. And the red light will disappear automatically when the charging is completed.