An "adjustable handlebar" refers to a type of handlebar on a bike, scooter, or similar device that can be changed or moved to different heights or angles. Full definition
A double jogging stroller with adjustable handlebar options is better since it can be used by multiple persons and it is suitable for both parents who are of different heights, enabling you to adjust depending on your height, for a comfortable and safe ride with your twin kids anywhere freely. (strollerlab.net)
Height adjustable handlebar which is made from new strong PU material that's wear and tear resistant. (jane-uk.com)
The stroller can accommodate even your taller kids as it features taller seat - back, longer foot - well and adjustable handlebar for heights. (10exposed.com)