2 PCS Fireflies Series Motion Activated LED Wheel Lights for Bikes and Cars

1) Flash Wheel Light for car / motorcycle/bike

2) Automatically on when the wheel runs / off when the wheel stop running

3) Compact design and lightweight High intensity light increases visibility at night for safety

4) Makes impressive effects which vary with wheel speed -- all the way up to full motion circle

5) 3 x L1131 batteries included (replaceable)

6) Length: 6.5cm