1:3 power amplifiers push-button select switch input,3 sets of stereo speakers push-button select switch output (3 sets of speakers can be opened or closed independently) 2: 3 sets of stereo speakers can sound at the same time, you can also turn off one group of speakers or more groups of speakers individually, manually select the pushbutton switch 3: The maximum power of each channel is 300W 4: Signal input provides vacuum tube power amplifier signal no-load protection function 5: manual selection of input and output switching, straight plug straight use, switching signal stability, between channels not produce another dry close or noise 6: Compact design of solid metal shell, easy installation, the product does not need external power 7: simple installation: input and output plug and play easy installation, you can enjoy different audio experience Compatible with all types of power amplifiers and speakers Input/output accepts heavy-duty speaker wire or speaker pin wire through the terminal port Connect the power amplifier to amplifier 01-02-03 Connect the loudspeaker to position A-B-C respectively Turn on your power amplifier stereo device and the product requires no external power supply Input:3 sets of inputs (banana plug) Output:3 sets of output (banana plug) Power: up to 300W Metal material, fine steel housing, compact size suitable for any system Channel Power: Each channel supports up to 300W of power Frequency response: 10Hz-50KHz Colour:black Material:Aluminum alloy Package Contents: 1 x Amplifier Speaker Switcher Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.