1With excellent airflow design, it can be used in allweather, rainy and humid weather. 2Used for any type of outdoor activities such as basketball and football, camping, hiking, hunting, fishing, boating. 3Lanyard type, it is easy to carry, avoid loss, and can be inserted into other items such as keys. 4Suitable for field adventures, women, children, and sea rescues for help and early warning. 5Suitable for traffic police, security, vehicle scheduling management and other scenarios.