[Product Content] You Will Receive 2 Pieces Of Blow-Free Squeeze Whistle.The Size Of Each Whistle Is About 6.5*11.5Cm, And The Colors Include Red And Black, Which Are Suitable For Training, Competitions And Other Sports Activities. [Product Material] This Product Is Made Of Plastic To Ensure That It Is Lightweight And Durable.The Plastic Material Makes The Whistle Work Normally In All Weather Conditions And Is Not Easy To Damage. [Innovative Design] This Product Has A Unique Design And Adopts A Blow-Free Extrusion Design.When Used, You Only Need To Squeeze To Make A Sound, No Need To Blow, And It Is More Convenient To Use, Especially Suitable For Coaches And Referees. [Easy To Carry] This Product Is Compact In Design And Easy To Carry.You Can Easily Put It In Your Pocket Or Hang It On Your Backpack, And It Can Be Used Anytime, Anywhere. It Is Very Suitable For Outdoor Activities And Various Sports Venues. [Widely Used] This Product Is Very Suitable For Sports Training, Competitions And Other Outdoor Activities.Whether It Is A Coach, A Referee Or An Athlete, They Can All Benefit From It And Improve The Efficiency Of Competition And Training.