Features: brand new and high quality 4 power amplifiers push-button select switch input,2 sets of stereo speakers .push-button select switch output (2 sets of speakers can be opened or closed independently). 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. The maximum power of each channel is 300W. Signal input provides vacuum tube power amplifier signal no-load protection function. Manual selection of input and output switching, straight plug straight use, switching signal stability, between channels will not produce another dry close or noise. Compact design of solid metal shell, easy installation, the product does not need external power. Simple installation: input and output plug and play easy installation, you can enjoy different audio experience. Specifications: 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 1-2-3-4 Connect the loudspeaker to position A and B respectively Turn on your power amplifier stereo device and the product requires no external power supply Input: 4 sets of inputs (banana plug) Output: 2 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 Product size: approx. 240x105x55mm/9.45x4.13x2.17in Package Includes: 1Set x Amplifier Speaker Selector Switch note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!