Practi-Man CPR Manikin Set of 4Very easy and fast to assembly and disassembly. 4 pack Practiman CPR Torso Set Uniquely designed dual function Adult and Child CPR Training Torso Switch between modes with manual dial Dial adjusts both the depth of compressions and volume of ventilations to that of either an Adult or a Child Saves you the need of having to buy separate manikins to teach both Adult and Child CPR Can be used with an AED Trainer One way valve system on airway promotes