brand new and high quality Plug it in the hole on both ends of your bicycle handle bars. Suitable for the tubes which diameter is between 16-23mm, external diameter is 25.2mm. Long lasting, and safety attached, it will give you for extra safety while cycling at night. Simple and convenient to keep it with you, a good assistant for bicycle decoration. LED light color: red 2 working modes: Strobe /Steady Material: Silicone and alloy. 5 Colors for choose: Blue/Black/Red/White/Silver Battery included:2 x AG10 (Each LED light) There are 3 kinds of flash speed by pressing once, twice, three times. Size:4.5cm x 2.5cm /1.76'' x '' x 0.98''(approx) Quantity: Note: Please allow 1-2cm error due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual colorof the item. Thank you!