[Size: The Adjustable Inflatable Lifejacket is designed to offer maximum buoyancy and safety for adults weighing up to 150kg (330 lbs). Easy to Use: Our inflatable lifejackets are designed to automatically inflate within 3-5 seconds after entering the water Automatic Inflatable Lifejacket inflates automatically via replaceable CO2 cylinder (not included). Reflective Strips and Whistle: The vest is equipped with 3 M reflective strips and a whistle which can help rescuers locate you in low-light conditions and alert them to your. Design to Ensure Safety: The Lifejacket is equipped with high- quality fluorescent reflectors on both sides. The searchlight at night can be illuminated by high-intensity reflections which can be better found. Equipped with a whistle. Premium material: The floating Lifejacket offer excellent performance designed for you and is made of high- quality nylon composite material which is manufactured under strict quality control.]