Hold down the hidden button under the "o" in computer scales for about 6 seconds. This will bring up the hidden menu.
Use the "wheel weights" button to scroll through the choices until "auto sleep" comes up.
Push the "zero" button to enter auto sleep.
Use the "wheel weights" and "baseline recall" buttons to set the desired auto sleep time setting.
Press the hidden "O" button to save the setting.
Press the on/off button a couple of times to exit the menu.