Replacement Shoulder Strap is designed for Zoll AED 3 Standard Carry Case for easy use on-the-go. Strap adjusts to the most comfortable length for you. It is padded on the top so you won't feel the weight while carrying the AED 3 Defibrillator with preconnected CPR Uni-padz electrodes and a backup set of CPR Uni-padz (all not included).