Turning it on, turning it off and all the variations thereof...
To see the startup procedure, skip to around the 1min mark of the below video.
Press and HOLD the Power button for approximately three seconds (black button located on the blue face of your Walker / the only button on the entire Walker), then watch the four status lights next to the power button, as it boots.
Press and HOLD the Power button for approximately three seconds until most of the status lights turn off. The green Power light will stay on for a short time while it completes power-down procedures. (If a Reader is paired, it will also shutdown automatically after the Walker shuts down.)
If all else fails and you can't shut down your Walker, insert a paperclip into the reset pin hole on the device to push the internal button. The power will cut out immediately and the Walker will reboot. You should be able to use the Walker now, or you can now follow normal shut-down procedures.
Restart or shutdown from Console
If your Walker is connected to the Console, you can shut it down or reboot it remotely: With your Walker turned on, open the ELEMENTICE Console and click on "Devices" tab on the top banner of the Console and select the relevant Walker.
You are now on the Device Page and can access the Shutdown or Restart commands from the row of controls above the image feed.