Power-up and operation have not been confirmed. Testing was not possible due to a faulty power switch. Please purchase only if you are able to repair it or understand its condition. Thank you. The Pioneer SA-V21II is a multi-functional stereo mixing amplifier, equipped with volume knobs for sound quality adjustment. - Brand: Pioneer - Model: SA-V21II - Function: Stereo mixing amplifier - Controls: Volume adjustment knobs - Connection Terminals: Multiple input terminals Thank you for viewing.