1. Full length: 35cm. 2. Perimeter: 29cm. 3. Width: 2.5cm. 4. Individual weight: 30g. 5. Material: Nylon webbing with LED electronics. 6. Blinking mode: constant light, fast flash, slow flash, off (4 modes are controlled by switch). 7. Battery: 2 LIR2032 35mAh 3.6V button batteries (button-type rechargeable lithium ion batteries). 8. Battery type: 60 hours of light time and 2-3 months of normal use. The battery can be replaced by yourself. It is available in convenience stores or supermarkets. 9. USB charging model: it can be used for about 2 hours after charging for 20 minutes, and can be recharged repeatedly for a long life. 10. Applicable to: outdoor sports, night running, festival parties, etc.