1. Portability: The whistle is small and light, easy to carry. Traditional whistles do not interfere with your daily activities, while electronic whistles can be hung on a key chain or put in a pocket.

2. Practicability: The whistle can be used in various occasions, such as sports competitions, outdoor activities, dog training, emergency signals, etc.

3. Cheap Price: Whistles are generally not expensive and are a very economical tool and entertainment product.

Easy to use: Using a whistle does not require special skills or training, and most people can learn it in a short time.

5. Diversity: There are many different styles and colors of whistles, which can meet different personal preferences and needs.

Product Name: Whistle

Color: Black, Red, Yellow, Green, blue

Weight: 0.028kg (net weight)

Ingredients: Engineering plastic (ABS), nylon rope, metal whistle ring and hook

Packing: 1Pc