Tibet Tech 8-DVD Prayer Wheel powered by both solar energy and AA battery - 8-DVDs with 84,348,750,000 prayers Amplify Your Prayers. Generate an almost incomprehensible number of prayers in a short amount of time. Billions of mantras on each DVD radiate happiness and healing for all beings. The most powerful, useful and innovative prayer wheel in the world. All DVDs are blessed and consecrated. Solar-powered, but can also run with one AA battery (battery not included).