KORG Tempo Sync Earphone Type Metronome Set of 2 2PCS Ideal for Marching Band Dance Team Outdoor Practice Black GM-1

You can hear the same tempo in your ears. Earphone type metronome with synchronization function. Tempo synchronization is possible by connecting the main units and communicating infrared. Achieves a high grip that fits a variety of ear shapes. Also supports odd time signatures. You can practice a wide range of songs. Comes with S, M, and L size ear pieces.