Product name:running lights for runners Product size about : 38*3*1.5cm/14.96*1.18*0.59in Product color: As shown in the figure Light source:10pcs*0.2W high brightness white COB+9pcs*0.2W high brightness red COB. Power supply:350 mAh polymer battery. Discharge time:2.5 hours for white light, 2.5 hours for red light. Charging time:1.5 hours. Charging current:620 mA. Function:100% white light in first gear, 100% red light in second gear, alternately flashing red and white light in third gear. Product material:polyester fiber product features: 1. MULTIFUNCTIONAL: The Night Runner Arm Light Wrist Strap offers a variety of functions and modes to provide a customizable lighting experience based on your personal preferences. 2. LONG LASTING PERFORMANCE: With a 2.5 hour battery life and USB charging, this wristband light ensures long lasting performance and is perfect for long nighttime activities. 3. WATERPROOF AND LIGHTWEIGHT: The wristband light is waterproof and suitable for use in all weather conditions. Weighing only 36.5 grams, it is lightweight and comfortable to wear, making it ideal for use during sporting activities. 4. Secure and Durable: The elastic band provides a secure fit and ensures that the wristband light will not fall off during strenuous exercise. In addition, the strap is durable and can withstand wear and tear. 5. 5. Versatile and Applicable: The product has a wide range of applications, not only ideal for running, but also for other outdoor activities that require increased visibility and safety, such as cycling, hiking and camping. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can feel free to contact mewe will give you some suggestion, but it is for you reference only. Shipment includes: 1 pc running lights for runners