Based on the lunar day of 24 hours and 50 minutes, this movement tells the general time of high and low tide. Movement measures 2-7/8" x 2-1/8" x 1" with an 11/16" handshaft length. Maximum dial thickness is 1/4". A set of push-on hands included. The black hour hand is 3-1/2" long as measured from the center of the 5.0mm mounting hole to tip. The minute hand is 4-3/4" long as measured from the center of the 3.15mm mounting hole to tip. The blue tide hand measures 3-1/16" from the center of the 7.25mm mounting hole to the tip. Includes a red 4-3/8" second hand that can be trimmed to size. With a brass movement mounting nut. Runs on one AA battery, not included. Asia. We recommend Duracell or Rayovac batteries. Other batteries can cause the clock movement to malfunction.