This is a regular Trek mountain bike that has been fitted with a 1000W Bafang HD mid-drive kit.
It’s a relatively easy setup with just a few hitches. Firstly, due to the geometry of the bicycle, you need to use a couple of spacers to push the motor out a little further than usual so that the chain ring clears the chain stay. Once you do this, the chain line doesn’t run beautifully straight so you have to lock out the lowest gear otherwise the chain will jump off. Other than that it all works well. The Bafang 1000W HD motor is a very powerful motor. Definitely designed for off-road use only. Great addition to a hard tail mountain bike for some fun trail riding. The Marlin 5 and 6 work equally well if you prefer a slightly higher end mountain bike to convert.