The device itself works fine. There are no instructions included with the
device. The device does have a screen, There no on and off function so the
battery was flat from factory.
The lack of instructions meant figuring out there is a clip down behind the
resistance adjustment you push out as the front is a snap on sheet of plastic.
The battery is a cr2450 which is overkill for what it needs to power. Thankfully
it works fine without wasting money on a digital counter.