The buttons are uniquely arranged to look like a smiley face:
ON/OFF (The Mouth): Press once to turn the device on or off. If the weight is locked on the screen, tapping it unlocks the value.
TARE (Left Eye): Clears out the weight of an empty container. Hang a bucket or bag first, press TARE to return the screen to 0.000, and then fill the container to weigh only the items inside.
UNIT (Right Eye): Changes the unit of measurement. You can cycle through Kg, Lb, JIN, and OZ by repeatedly tapping it.
