Using this battery holder is a breeze. First, open the holder by unscrewing the two Phillips head screws. Place two CR2032 batteries inside in the right orientation. Then, screw the holder back together. To start using it, slide the On/Off switch to the 'On' position. The power wires on the back can be connected to your device. When not in use, switch it off to save battery life. Keep the holder dry and clean. Avoid dropping or subjecting it to strong impacts. If you notice any damage, stop using it right away.