The tower is cylindrical (diameter 6.8 m), two stories high, built of cobblestone and square brick, plastered inside. The building is damaged: the upper parts of the walls have collapsed. The entrance is on the southwest, at the first story, with a double loophole on either side of the door. Built into the north wall is a rectangular fireplace flanked by double loopholes. In the east wall is a stair leading to the second story, which has one single loophole on the east and one double loophole on each of the other three sides. All the loopholes are set in niches. The building is ringed by bands of flat cobblestone laid in herringbone pattern. The roof is domed, laid in square brick.