Ok Baby Orion bicycle child seat that mounts on the head tube of frames with a round cross-section between 32 and 52 mm in diameter. The head tube must have a height between 1 and 14.5 cm. Orion is suitable for transporting children from approximately 9 months old and/or with a minimum weight of 9 kg, up to a maximum of 15 kg. The Orion seat must be mounted between the handlebars and the rider on the bicycle's head tube.

The child must be able to sit up independently for at least the entire duration of the bike ride. The material of the seat (polypropylene) loses some of its mechanical properties with the aging process if exposed for a long period to environmental influences (sun, rain, ice, etc.). In case of normal use and exposure to environmental influences, it is recommended to replace the seat after three years.