Design, everything comes from the humanized concept: fashion, safety, thoughtfulness, liveliness, beauty, equality Nylon webbing+LEDPU optical fiber+ABS engineering plastic switch box Each process has passed rigorous testing, including tensile testing, strength testing of plastic and metal fasteners, oxidation resistance and corrosion testing. [How to use]: Adjust the long light through the switch. Fast flash. Slow flash. Close [Light emission color]: Red light. Yellow light. Blue light. Green light. Bright orange. White light. Pink light. Colorful discoloration 【Flash arm strap size】: Overall overall specifications: length 35cm width 2.5cm Switch box specifications: length 3.5cm width 2.5cm Velcro specifications: length 12cm width 2.5cm Adjustment range: suitable for 27cm-31cm Manual measurement, the measurement method and tape measure are different, and the error is kept at about 2cm [Light source description]: The LED light emits light, and the PULED light guide optical fiber strip realizes the entire optical fiber emitting light, so as to achieve the function of lighting warning and safety. This product is of export quality, effectively rain and waterproof, the battery can be removed when cleaning, and the battery can be replaced after cleaning and drying. It is suitable for dark environment or night activities and outdoor sports . It emits light through LED LED fiber, which plays a warning role and expresses individuality at the same time. The design is fashionable and suitable for use in day or night. [Battery]: The product itself comes with 2 CR2032 button batteries, the measured data can last for 30-40 hours when the long light is on ; the battery can be replaced by yourself 1: Is the battery replaceable? Answer: Yes, watch shops. E-shops. You can buy them all 2: What is the flash mode like? Answer: Fast flash, slow flash, long light, off 3: How long can it be used for? A: About 30-40 hours 4: Can the webbing be washed? Answer: The light-emitting fiber can be pulled out when cleaning, and it can be put back after cleaning and drying.