Flat Survival Whistle includes the following features : 

• This whistle has three holes, each with a different sound
• Various blowing methods can produce different sounds and are more recognizable
• Attached with a chain for easy carrying and preventing loss
• Suitable for outdoor adventure, sports competition, emergency call for help and campus teaching

Material :

• PS plastic body

Size closed :

• Length of 7.1 cm x Width of 2.8 cm x Thickness of 0.8 cm