Vacuum tube-style headphone amplifier, AT-HA20. - Model: AT-HA20 - Brand: audio-technica - Input Terminals: RCA (red/white) terminals - Output Terminals: Headphone jack - Power: DC 12V - Features: Vacuum tube-style design - Volume Adjustment: Analog volume The power turns on, but the operation has not been confirmed by listening to sound. It appears to be almost unused, but it was purchased by my father and is old, so no guarantee can be made. Please purchase as a junk item. Pet owner. No smoking. #at-ha20 #headphoneamp