WHAT KIND OF BATTERIES DO I NEED FOR THE MICROPHONES?
You can use normal AA-batteries or rechargeable AA-batteries. The charging of the rechargeable batteries must be done in a separate battery wall-charger.
CAN I USE FOUR WIRELESS MICROPHONES AT THE SAME TIME?
Yes you can, only if the frequency between all the mics are different. The Wireless Microphone Set U-TUBE 20 comes in two different frequency pairs; 864,900 MHz / 863,100 MHz and 863,550 MHz / 864,300 MHz