About TERENCE Mechanical Metronomes: Complete Functions: This metronomes have no batteries average 20-minute wind for a longer practice and less frustration steel gears for durability 40-208bpm for choosing any tempo and easily adjustable/optional 0/2/3/4/6 beat bell. Easy to Use Even for Children and Beginners: Open the cover wind up the spring set the tempo select the beat and move to start then you are ready to use; An average single full wind (2160 clicks) lasts at least 18 minutes depending on the tempo. Metal Movement: ALL pieces of movement are made of metal. This can ensure long time use without error. It is very important for a beginner. Classic Design: Metronomes feature a classic style that meets daily usage while becoming an elegant decoration for the room. How to Use? Step 1: Remove the white stopper from the metronomes body bottom and hold the cover lower part and pull it off from the metronomes body. Step 2: Turn the winding key in clockwise direction till the spring fully wound up. Step 3: Sliding up or down the weight to position the weight s top line to the desired tempo number on the meter plate. Step 4: To set a beat move the beat selector to 2 3 4 or 6. Step 5: Check that metronomes are placed level move the pendulum gently sideways to start the pendulum movement. Step 6: After using put the pendulum into the slot and put the transparent cover back. Specifications Material: plastic & metal mechanism Tempo range: 40~208 bpm Beat: 0 2 3 4 6 Power: winding mechanism Dimension: 3.9*4.5*8.1in Weight: 1.4lb Tolerance less than 1% Package： *mechanical metronome *user manual