Features: Unique concealed rod-like microphone, specially designed for harmonica, magnetic design for convenient installation. Multiple pickups operate simultaneously, and balance acoustic design for picking up high/mid/low frequency sound of harmonica. Low gain and high SPL picking up promotes the max SPL level; the circuit of balanced mixing technology and unique impedance for Hi-Fi sound. UHF low power consumption, high anti-interference capability, and supports more than 40m transmission range. Cell phone accompaniment music and harmonica sound can be transmitted simultaneously; advanced RFI shield technology can isolate cell phone signal interference.