It is an air pressure dropper seatpost. There is also a suspension function. (If you don't need this function, you can choose KSP 900-I) KSP 900-I Link: https://zanbbel.com/img/OvzR8K0fnsfCdj1ItszbeHZN017-qIHMxEM-cIJTvcZRahKpG40dTZMqdOat3sfEsgsH4EiPJk6RJDPtlkCr3MkbAvuokYTOSlFzWKqI.jpg?w=800 feature: BRAND: EXAFORM Model: KSP 860i Wire Remote Control travel distance: 125mm diameter: 30.9/31.6mm length: 395mm weight: 31.6x395mm approx. 541g, 30.9x395mm approx. 530g (with wire) type: air pressure suspension function Travel 125mm type use below table to pump your seatpost to the correct pressure Travel 150mm type use below table to pump your seatpost to the correct pressure

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