Are you still bothered by the laborious blowing of traditional whistles? This upgraded electronic whistle comes with a USB charging port.one time charging, long-lasting use, save money and convenient. Three different whistles can be switched at will to meet the needs of various scenes. Can be used as a sports whistle for teachers, soccer coaches,volleyball coaches to train and command, or as a signal whistle for emergency survival in the field, you can find the most suitable sound. Adjustable whistle volume level for precise sound control to convey instructions. Handheld whistle with lanyard design, easy to carry. The whistle is also designed with a small light, which can play an important role in nighttime police dog training and field emergency. DURABLE AND EXCELLENT QUALITY, MADE OF HIGH QUALITY ABS MATERIAL - This electronic whistle is mostly used outdoors, so the case is crack and drop resistant. This upgraded electronic whistle is suitable for school teachers, sports coaches, dog trainers and wilderness survival enthusiasts. Free yourself from the traditional way of blowing with your mouth and start a convenient life journey!