Furmax Office Chair Mesh Desk Chair with Adjustable Arms Ergonomic Computer Chair Rolling Chair with Back and Lumbar Support (Black)

When the chair is at its lowest setting, how high is the seat from the floor? I'm really short and would like my feet to rest flat on the floor

pls. could you tell me wich are the box measures ??

When the chair is in the lowest position, how high are the arms from the floor? I need to fit it under a desk.

Is the Lumbar support adjustable?