1: Volume knob with switch, this product can control the volume according to the needs of users.2: The product has a built-in high-fidelity amplifier chip, and the left and right channels and headphone output can directly drive 8-300 ohm headphones or satellite speakers.3: Support digital optical input and digital coaxial output (digital optical fiber to digital coaxial), optical fiber and coaxial input interface.4: Support digital coaxial input and digital optical output (digital coaxial to digital optical fiber)5: Support digital optical fiber, coaxial to analog audio R/L 3.5MM headphone output. Output interface: optical fiber, coaxial, analog left and right channels, analog 3.5mm headphone output.Type: Riser CardInterface: FiberWire core type: copper coreNumber of branch connectors: single headEnvironmental requirements:Temperature (when in use) 0℃to +70℃; Humidity (when in use) 10% to 85% RH (no crystallization)Temperature (during storage) -10℃to +80℃; humidity (during storage) 5% to 90% RH (no crystallization)Power requirements: external power supply 5V DC@1A;size:8x7x3cmMaterial:ABScolour:Black