Using this RV Rex LED head is a breeze. First, take out the original head of your SH Figuarts Kamen Rider Revi Rex Genome and replace it with this LED head. To turn on the LEDs, use the included magnet to switch them on and off. Remember, you'll need to buy a CR927 battery separately and install it in the head to make the LEDs work. When it comes to maintenance, keep it away from water and extreme temperatures. If you're not using it for a long time, remove the battery to prevent any damage. And don't forget, if you pre - order and pay in full, you'll get free shipping within the USA!