This Symetrix 303 amplifier is a bi - directional interface unit. Note that it does not come with a power supply, and we couldn't test this particular unit.

How to use: First, you need to find a suitable power supply for this Symetrix 303 amplifier as it doesn't come with one. Connect the amplifier to your device according to the standard connection method. Attention: Since we didn't test this unit, there might be some unknown issues. Please handle it carefully. Maintenance advice: Keep it in a dry and clean place. Regularly check the connection points to ensure they are stable. If you notice any abnormal situations, stop using it immediately and seek professional help.