Avalanche airbag, beacon, probe and shovel are safety equipment, not a guarantee of rescue. If a device fails in an emergency, the first distinction is user error, missing instruction, maintenance defect, product defect or chance.
With rented equipment, duties of the rental provider and instruction duties become important. A defect may also raise product liability and warranty issues. Injured persons and relatives should ensure that the device is not returned, repaired or discarded too quickly.
This article complements existing ski touring content. It does not cover general guide liability, but the concrete equipment and rental case.