UHF wireless microphone is less likely to subject to interference than VHF microphone. Reliable signal and no worried about the sound will be cut in and out during use.
Features:

Cardioid microphone does an good job at rejecting background sound. It is especially helpful when making speech in less perfect environment like outdoor.
Fine-tuned integrated circuit of microphone suppresses self noise and handling noise well.
Impress audience with audio clarity. Wide frequency response guarantees the crisp tone out of your vocal without losing too much bass at the same time.

UHF (Ultra High Frequency) is more penetrable and powerful signal, therefore a better choice for using in built-up areas. In classroom, church or the place where loads of objects standing in the way, wireless range is up to 80 feet already. Outdoor performance could only be better and more stable! Obstacle is no more fearful. Distance can not spoil your live event any more.