Tibetan Prayer Wheel

Tibetan Prayer Wheels are a manifestation of the Compassion Buddha’s holy speech. According to Lama Thubten Zopa Rinpoche, turning the Prayer Wheel with a Bodhichitta motivation while reciting the six-syllable mantra allows one to "collect more extensive merit to quickly achieve enlightenment than an arhat who abides for many years in the blissful state of peace for oneself alone." In a text by the 4th Panchen Lama, translated by Lama Zopa Rinpoche, Amitabha Buddha says, “Anyone who recites the six syllables while turning the Dharma Wheel at the same time is equal in fortune to the Thousand Buddhas.” Shakyamuni Buddha also states that “turning the Prayer Wheel once is better than having done one, seven, or nine years of retreat.” 

(Quotes from the foreword of Wheel of Great Compassion: The Practice of the Prayer Wheel in Tibetan Buddhism by Lorne Ladner.)