High quality ABS Plastic case with rear cover, glass lens, custom colors finished frame, off-white Arabic numerals dial and AL hands. The locking rear cover twists off for easy wall mounted to a wall with 3-point secure screw mount system, this clock an ideal choice for boats and recreational vehicles. Water resistant rear cover designed. Low consumption power Quartz movement, 1 AA battery operated(not included) Made in Taiwan. Dimension: 21(W) x 20.4(H) x 4(D) cm; 8.3" W x 8" H x 1.6" D 8.5-inch Quality Square Water Resistant Quartz Wall Clock Special for Small Space, Office, Boats, RV High quality ABS Plastic case with rear cover, glass lens, custom colors finished frame, off-white Arabic numerals dial and AL hands. The locking rear cover twists off for easy wall mounted to a wall with 3-point secure screw mount system, this clock an ideal choice for boats and recreational vehicles. Water resistant rear cover designed. Low consumption power Quartz movement, 1 AA battery operated(not included) Dimension: 21(W) x 20.4(H) x 4(D) cm; 8.3" W x 8" H x 1.6" D