This model is a battery holder for BOBOVR(MOMOVR) M2 elite strap.Attach this to the back of the strap. PLA, ABS, PETG are recommended as materials.When modeling, it is recommended to lay it on its side as shown in the photo. You will need three velcro straps or cable ties to install the battery. One is through the hole in the center. The other two fix the battery. It is good to have a non-slip sheet to fix the battery. momovr-bmount006 v4.stl is for Anker PowerCore 10000 PD Redux 25W. momovr-bmount-all v4.stl is general purpose. momovr-bmount-all-s v5 is data for people who make their own mounts.