[. . . ] Easy to connect to a hi-fi or karaoke system, this microphone uses a high radio frequency as the signal carrier, ensuring a very clear, sharp reception. [. . . ] When using only one microphone set, ensure that channel A is selected on the receiver. When using two microphone sets in the same room at the same time, switch the second microphone set to channel B. Microphone: power on switch tuning knob power on and battery LED Receiver: tuning knob micro output power adapter input (DC IN 12 V) channel selection switch power on indicator If the LED does not light up, the battery is empty and should be replaced. When using only one microphone set, ensure that channel A is selected on the receiver. When using two microphone sets in the same room at the same time, switch the second microphone set to channel B. Before you dispose of batteries or accumulators, ask your dealer whether they are subject to special recycling and if he accepts to take them back. [. . . ] This declaration applies to all specimens manufactured in accordance with the attached technical documentation described in the annex II of the Directive which form part of this declaration. [. . . ]