- Flash Wheel Light for car/motorcycle/bike<br />- Automatically on when the wheel runs/off when the wheel stop running<br />- Compact design and lightweight High intensity light increases visibility at night for safety<br />- Makes impressive effects which vary with wheel speed -- all the way up to full motion circle<br />- 3*AG10 batteries included (replaceable)<br />                                                                                                                                Dimensions: 2.36 in x 0.71 in x 0.28 in<br />Weight: 0.92 oz