Patented pre-positioned electrodes. Save(up to 70%) time on lead placement & procedure time by 30%. Easy & Simple w/-minimal training & fewer errors misplacements. Consistent placements aids in serial comparisons of ECGs overtime. #F01144UNI04001-Sm #F01145UNI04001-Md #F01146UNI04001-Lg #F01147UNI04001-XL UNSPSC#42181708 For more sizing options go to https://www.qtmedical.com/en-gb/downloads