Portable Whistle: Safety whistle length: 51.3mm/2.02in, width: 7.1mm/0.28in, weight 6.7g/0.2oz, the whistle is small in size and light in weight, which is perfect for daily carrying. Equipped with paracord, it's very convenient to carry it, whether it's hanging around your neck, putting it in your pocket, or hanging it on your key chain.