Well, its a tourniquet, not a defibrillator. This is not improved technology on display, but aggressive marketing. Black dyed tactical toilet tissue is not more functional than Charmin.

We used tourniquets professionally, occasionally to be sure, in the ER. Usually used a blood pressure cuff, but occasionally improvised with fabric and a big kelly clamp, if the blood pressure cuffs leaked and lost pressure. We used a cuff because applying less pressure over a wider area of the artery was less likely to traumatize the vessel. But there is no magic involved: a loop of 550 cord, a piece of webbing, tightly wrapped coban, ace bandage or duct tape can all be or direct digital pressure can be perfectly effective in slowing or stopping arterial bleeds.
Tourniquets buy some time to definitively treat the wound by ligating the artery and cleaning and dressing the defect. While the tourniquet is in place, all of the tissue that is perfused by the arteries involved is dying. Better to lose a limb than a life, but one has to have a plan for care of the patient after the tourniquet is applied.

Anyway, lots of money is made in the marketing of tacticool equipment. Not all of the items sold perform their function better than traditional methods: be a wise shopper.
Dance like you have never been hurt, work like no one is watching,love like you don't need the money.