Audrey Weisiger's Grassroots To Champions - Ankle Buzzer! Easily adjustable (for left or right skaters) provides instant feedback and speeds up the learning process of correct jump alignment. Helps skaters achieve proper foot placement on double & triple jumps. Buzzer will make sound when skater achieves the correct foot position in the air. Now comes with 2 sound boxes! Great teaching and training tool. Endorsed by the PSA. To view instructional demo video, CLICK HERE