One the hour, the clock plays a melody ( 12 Hi - Fi melodies :A & X / Westiminster) Light sensor disengages all melodies when it becomes dark Volume control Demonstration buttom Pendulum Wooden case ( alder / MDF / Maple veneer) Aluminium dial 3D Numerals 18.3 x 18.3 x 10.6 cm Berat 2.4kg Free 3pcs battery AA