Item is in very good condition, tested and in working order. Comes with original box. 

Features of the Yamaha BC-1 Breath Controller

Breath Sensitivity: Converts the air pressure from the player's breath into an analog output voltage, allowing for expressive control over synthesizer parameters.

Compatibility: Designed to work with Yamaha synthesizers, particularly the DX7, and can be used with other models that have a breath controller input, such as the DX100, DX11, CS-01, VL70-m, and VL1.

Expressive Control: Provides dynamic and nuanced control over parameters like volume, pitch, and filter cutoff, enhancing the musicality and expressiveness of electronic instruments.

Compact Design: Small and lightweight, making it easy to handle and use during performances.

Durable Construction: Built to withstand the rigors of live performances and studio use.