Click to fire. Press 1, 2, or 3 to set the sentry level. Press 4 to change the sentry into a mini-sentry. Press 0 to turn on Wrangler mode. Press R to switch the sentry to RED team. Press B to switch the sentry to BLU team.
Based off the sentry from Team Fortress 2. Currently, the only bug is that the wrangler beam occasionally bends towards the corner on the end segment.