Giới thiệu Còi Thổi Điện Tử Có Thể Điều Chỉnh Âm Thanh Dùng Trong Luyện Tập Thể Thao Ngoài Trời

Description
Compact size and lightweight, easy for carry.
Three frequency design, adjustable three levels of sound.
Suitable for sports competition and training, football, basketball, tennis, and other ball games.
Also can be used for traffic command, lifesaving, pet training, etc.
Simple button design, easy operation.
 
Specifications:
Color: blue, yellow, black, red
Size: about 136.5x38mm
Decibel: max 125db5%
Battery: built-in 4xCR2032 button cells
 
Package include:
1*electronic whistle
 
Note:
1. Due to the light and screen difference, the item's color may be slightly different from the pictures.
2. Please allow slight deviation for the measurement data and make sure you do not mind before ordering.
3. Don't whistle the electronic whistle beside the ear. Under 100-120 decibels, people can't stand it. If you stay for a minute, you may be temporarily deaf.
4. Do not whistle directly to others when using
5. Electronic whistle is not a toy, please do not play for children
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