Mouth organ, metal reeds that vibrate as air passes through, can play melodies and chords. The reeds are such that they sound on both the inhale and the exhale, like those of its descendant, the harmonica.
This one is in the key of C, with 17 pipes of purple bamboo. 22 inches tall and 9 inches wide at the mouthpiece.
Video (note: the sheng in the video is much larger than the one we're selling):