The BK9520 series is a chipset for wireless microphones, including transmitting chip BK9521 and receiving chip BK9522,. Each chip covers V-segment 160~270MHz and U-segment 500 and 980MHz.

The BK9531/ BK9532 chip is a chip set for wireless high-quality voice transmission, which comprises a transmitting chip BK9531 and a receiving chip BK9532, wherein each chip covers the frequency range of 160~270 MHz and U The segment is 500~980 MHz.