Each stylus requires two AAA batteries. To insert the batteries, unscrew the top of the stylus. Insert both batteries with the positive (+) facing down. Screw the top back on.
To turn the stylus on, slide the oval power switch down towards the tip of the stylus. Please be sure to turn the stylus off when not in use to preserve battery life.
To test that the stylus is working, press the small circular button next to the power switch or tap the tip of the stylus to a hard surface. If the stylus is working, you the tip of the stylus will light up.