Thank you for viewing. This is the Maxon Phase Tone PT999. While it resembles the MXR Phase 90 in appearance, this one produces a gentler, warmer phase sound. Recently, guitarist DURAN seems to be using this model. Operation has not been confirmed. There are scratches and dirt. As it's an old product, there may be some crackling in the jacks, but it doesn't affect performance. It's likely a vintage item from around the 1980s. Please consider it as a used item. No claims and no returns accepted. ↓ The following is a quote ↓ The Maxon Phase Tone effector allows switching between normal and phase shift modes and has a speed adjustment knob. - Brand: Maxon - Model Name: Phase Tone - Functions: normal/phase shift - Adjustment knob: speed Thank you for viewing. Type... Electric Guitar