Adopting magnetic design, this bracelet is easy to put on and take off. And the USB charging is very convenient to use. Luminous function is very convenient for you to use in dark ambience and it helps to increase atmosphere, very useful. It is made of good ABS and PVC material. Inner diameter of the bracelet is 6cm. Durable bracelet is suitable for concert, holiday party, bar party, annual meeting celebration, fan support, etc. Item Name: Luminous Bracelet Material: ABS, PVC Endurance: About 10 Hours Function: Flash Fast/ Slow Flash/ Always Bright Features: Luminous, Magnetic, Lightweight, With Light Battery: Battery Style (Two Button Batteries Included) Rechargeable Style (45mAh) Size Details: Inner Diameter: 6cm/2.36" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Luminous Bracelet