Adopts winding mechanism for power to produce metrical beats?? no battery is needed?? more longer using life.</br>Pendulum weight is adjustable?? sliding up or down the pendulum weight to chose the desired tempo number. Variable tempo from 40 to 208 bpm per minute.</br>0?? 2?? 3?? 4?? 6 beats for you to chose by a beat selector knob?? easy to use.</br>Easy operation?? perfect practice tool to produce regular?? metrical beats to help you play rhythms accurately.</br>Wide application?? can be used for piano?? violin?? guitar?? drums?? bass?? ukulele?? mandolins and other music instruments.</br></br>Product Description</br></br>Product parameter:<br>Brand: AROMA<br>Product name: Metronome<br>Color: Black<br>Features:<br>1. Top grade metal mechanism<br>2. Traditional beat demonstration<br> 3. 40-208BPM<br>4. Tolerance < 1% <br>5. Power: Winding mechanism<br>Dimensions: 284(H) X 104(W) X 119(D) mm<br>Weight: 650g<br></br><br/>http://www.amazon.com/gp/product/B01LL1504C