EASY TO USE: Simply wind it up ! Then you use the pendulum swing to choose your needed beat and tempo and let the pendulum go into motion. It provides a loud sound to aid you in keeping track of beats and tempo when practicing with various musical instruments. | PYRAMID CLASSIC DESIGN: The metronome comes in the classic design of a sleek pyramid style.It decorates your home when not in use. | NO BATTERY NEEDED: By winding up spring mechanism to operate, this metronome is economical and environmentally friendly. | LARGE SELECTION OF BEATS PER SECOND: The pendulum can make up 40 to 208 beats per minute. The beat selection is 0, 2, 3, 4, 6. You can easily adjust the speed of the beat and tempo by moving the weight up and down the pendulum rod. | 100% SATISFACTION GUARANTEED: Choosing us means enjoy worry-free service.Buy one now for your family and friends who is in need.