Features: High-quality 2-in and 4-out passive audio switch selector, making it easy to compare the sound quality of 2 amplifiers or 4 pairs of different speakers. There is no need to repeatedly plug and unplug cables to avoid wearing the socket contact points. The 6.35mm headphone jack is specially designed for use. It is suitable for connecting to power amplifiers without headphone output and has independent volume control, easily turning your power amplifier into a headphone amplifier. Each input and output is equipped with a signal switch, making it easy to select multiple audio inputs between the two groups. The 4 groups of audio outputs can be turned on/off independently, making it very convenient to use. And the maximum passing power of each channel can reach 300W, which can meet the requirements of most home speakers. It uses a purely mechanical passive circuit, which has no impact on the sound quality, and there is no need to worry about audio rendering or electromagnetic interference. Easy to use and install, no power required, no additional software required. Compact design, sturdy metal casing, looks simple but powerful, perfect for audiophiles who have multiple pairs of amplifiers/speakers or want to add headphone output function Packing list: 1 set x amplifier speaker selector switch Specifications: Audio input: 2 sets Banana Speaker Jack Audio Output: 4 sets Banana Speaker Jack/6.35mm Headphone Jack Pass Power per channel: Max 300W Frequency Response: 10Hz-50KHz Net Weight: 0.86 kg Packing Weight: 0.98kg Dimensions: Approx. 240x113x55mm/9.45x4.45x2.17 Note: Please allow 0-1 cm error due to manual measurement. Please make sure you don't mind before bidding. Due to differences between monitors, images may not reflect the actual color of the item. Thanks