The Boya BY-RX8 Wireless Receiver for BY-WM8 Pro is a wireless receiver that you can use with the BY-WM8 Pro-K1 and Pro-K2 wireless microphones. The BY-RX8 is ideal for interviews, ENG/EFP, movie productions and more. One of the features of the BY-RX8 is its low distortion rate, which results in higher sound quality. In addition, the receiver is compact and lightweight. The receiver uses two AA batteries (not included), allowing you to use it for up to 4 hours. The receiver has a range of 100 meters from the transmitter, if there are no obstacles in between.