Connect the power cable to the device, put the three-position switch on the back of the device in AC mode, the battery will be charged.
Yes, both microphones can work simultaneously.
Regular and complete charging is the first recommendation, if you do not use the device for a long time, recharge it every three months to maintain the health of the battery.
The battery needs to be charged, or if it has just been charged, you need a new battery.
The answer to this question is generally given by the amplifier manufacturers, in general the total resistance of the bands should not be less than 2 ohms. This is equal to 4 bands of 8 ohms or 2 bands of 4 ohms for each input.
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