Omron Blood Pressure Monitor Upper Arm Children/Adult Kid Small Cuff 17-22cm CS2

Medium Cuff 

Cuff fits arm circumference 17-22cm CS2

Compatible for the M2 Basic, M2 Classic and M3 upper arm blood pressure monitors

Not compatible for Omron Comfort Cuff devices: M6 Comfort, M7 and M10-IT

Not compatible for Omron MIT Elite and MIT Elite Plus