One possibility: Designate one or more emergency contacts in case a pulse measurement drops to zero, who can text back to see if you’re alright, if the battery’s died, or whatnot; and who can /then/ decide to call out the cavalry.
One possibility: Designate one or more emergency contacts in case a pulse measurement drops to zero, who can text back to see if you’re alright, if the battery’s died, or whatnot; and who can /then/ decide to call out the cavalry.