Features: 4-in 4-out passive amplifiers speaker selector switcher: supports 4 inputs and 4 outputs, meeting various speaker selection needs. Sound switching distributor: realizes flexible switching and allocation of sound signal, making it convenient for users to control connection. Comparator sound quality without loss: ensures that there is no distortions and quality loss during signal transmission, ensuring quality sound output. Flexible switching selection: The input source and output goal can be switches to meet connection requirements in different situations. Simple operate: no external power, simplifying line setsup, easy and quick operate, suitable for variety of user scenario. Specifications: Color: Black Size: about 320x110x62mm/12.6x4.33x2.44inch Product model: B070 Channel power: Each channel supports up to 300W Output channel: Supports 4 pair of passived speaker outputs Switching: use 4-speed rotating mechanical silver dot switches for switching Frequency response: 10Hz-50KHz Output impedance: 4-16ohms Package Includes: 1x 4 in 4 out Amplifiers Speaker Switcher note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.