You can vertically stack the units and they somewhat engage but surely not lock. I got mine for $89 and saw them on for $75 days later (Doh! applied guitar theory These were a gift for a 9 year old. These are incredibly comfortable and provide superior support. applied guitar theory It’s also too bad because they are so nice for the price. applied guitar theory It was easy plug and play, my computer and PS4 recognized with no issues, bluetooth found it as well no problems. Despite that, I still highly recommend this for use on a bicycle, or even as a portable speaker. and the verdict . applied guitar theory It does state a max of 55lbs so please keep this in mind; I took off front wheel to reduce the load and insure its continued success! (See photo)
applied guitar theory