Low-cut switch: -10DB attenuation switch is used to attenuate high-impedance output input interface: use 1/4 inch wire to connect TUNER to convey the signal to the amplifier or mixer. Output interface: use three-core card to connect the PA system L| FT-GND: When the switch is set to LFT, the case is not connected; otherwise, the case is connected SD202 is a mono impedance conversion device. Taking into account the on-site recognition of the stage and other factors, the bright yellow color scheme is used ingeniously, with a dust-free painting process, which is especially suitable for high impedance instruments such as bass, keyboard, and acoustic guitar. Impedance matching realizes impedance matching when high-impedance equipment such as electro-acoustic musical instruments (such as: electric guitar, electric acoustic guitar, electric bass, keyboard) is directly connected to the mixer mc balance input. When recording or performing live performances, many details in the signal become weaker during transmission. The unbalanced signal is converted into a balanced signal. The unbalanced signal with high impedance is very susceptible to external electromagnetic interference during long-distance (more than 10 meters) transmission, which will cause "seize" interference noise. Reduce incomplete signal transmission caused by too many effectors, signal content changes and other problems. The unbalanced signal is connected to the D box to obtain the balanced signal and then connected to the mixer for long-distance transmission such as live performances, recording or broadcasting systems. Audio-visual accessories type: DI effector Brand: Alctron Model: SD202 Colour:yellow Material:ABS Size: 50 x 119 x 38mm Package Contents: 3x impedance converter