It is powered by (ัะฐะฑะพัะฐะตั ะฝะฐ) a battery or solar cell (ัะปะตะผะตะฝั ัะพะปะฝะตัะฝะพะน ะฑะฐัะฐัะตะธ), in which the timekeeping is regulated by a quartz crystal that vibrates at a certain (ะพะฟัะตะดะตะปะตะฝะฝะพะน) frequency (ัะฐััะพัะต).