This is an enclosure for the Lilygo T-Beam 1W. You'll need a T-Beam 1W, which is not included with this enclosure.
 
Watch a demo of the assembly here
This Artman F550 battery is recommended, because it has a built-in USB-C charger that lines up with an opening in the bottom cap of the enclosure. This saves you from having to remove the end-cap to charge the battery. 
Steps for the assembly are also available in the T-Beam 1W DIY Guide
3D Printed using PETG
All screws are included
All the Heatsink nuts shown in the video will be pre-installed
 
The green front plate and end caps can also be done in black or pink if you prefer. If so, just add a note when you checkout.