1pc Night Running Armband Light LED Christmas USB Rechargeable Sport Safety Belt Arm Warning Wristband Cycling Bike Bicycle L Description: Product size: 2.5*27CM Light-emitting mode: fast flashing-slow flashing-long light-off (ON/OFF controlled by the switch) Battery drive: 2*CR2032 button batteries (use time is about 60 hours) Material composition: webbing light guide strip controller transparency film adjusting buckle Product weight: 23g Specifications: The optical fiber transparent wrist strap can be controlled, which is suitable for morning running, night running, cycling, mountaineering, camping, etc. It is also a cheering prop for various entertainment activities, bars, and concerts at night. The LED light effect not only has the iconic function of safety warning, but also brings you a sense of fashion and coolness; it is suitable for use during the day or night. Package Included: 1*Bracelet Note:The actual usable length of the product is 22cm, and it is only 27CM when fully deployed