Features: Multiple channel switching: Supports 2 inputs and 4 outputs, flexible switching and allocation from multiple sound source devices to multiple speaker. No loss in headphones output: Ensure sound quality in headphones output, providing quality sound experiences. Passive design: No external power required, simple and efficient, without causing interferences to signal. Speaker switch: The switches can be used to control the switching status of different speaker, facilitating the management. Quality: Small design with stable metal casing, easy installation. Specifications: Color: Black Size: about 240x113x55mm/9.45x4.45x2.17inch Earphones interfaces: 6.5mm Power: Supports up to 300W Frequency response: 10Hz -50KHz Package Includes: 1x 2 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.