Features: brand new and high quality 2-IN-4-out passive audio switch selector, convenient to compare the sound quality of 2PCS power amplifiers or 4 pair of different speakers without plugging in and out cables repeatedly to avoid wearing the contact point of the sockets. And a 6.35mm headphone jack is specially designed to connect the amplifiers without headphone output, and with independent volume control, easy to turn your amplifier to a headphone amplifier. Each channel of input and output with signal switch, easy to select between two groups of audio inputs, and 4 groups of audio output can be turned on / off independently, very conveneient to use. And maximum passthrough power of each channel can reach 300W, can satisfy the requirements of most home speakers. Adopting purely mechanical passive circuit, no impact on the sound quality, no need to worry about audio rendering or electromagnetic interference. Easy to use and install, no power is required and no additional software is needed. Compact design, strong metal case, looks simple but powerful, very suitable for those audiophiles who have multi pairs of amplifiers / speakers or want to add headphone output function to his amplifiers. Specifications: Audio input: 2 sets of banana speaker jacks Audio output: 4 sets of banana speaker jacks / 6.35mm headphone jack Passthrough power of each channel: maximum 300W Frequency response: 10Hz-50KHz Net weight: 0.86kg Package weight: 0.98kg Size: approx. 240x113x55mm/9.45x4.45x2.17in 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!