All the VHF wireless microphones used in the HS120B series HS122B,HS122BT,HS420 and HS700 are coming with different frequencies to avoid possible interference.
Each Handheld wireless microphone is built with a VHF transmitter. When you order from this page, just select the same number as shown on your system. The frequency is marked by a number, which is on a red dot sticker put on the system and microphone. Check the numbers that you have on your system, inside the battery compartment or on the side of the system.
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