The ISC Spare Air is the smallest redundant scuba system available with enough air to get you to the surface in an out-of-air emergency. The patented Spare Air should be a standard piece of scuba diving equipment for the safety-minded diver.
Features:
3.0 cubic feet of air (57 surface breaths)
Easily refills from your own scuba tank with included refill adapter (patented)
Easily attaches to your BC with included holster and safety leash
Small, hands-free, nearly neutrally buoyant
Breathe on demand regulator - No complicated instructions
Completely redundant back-up miniature scuba system
Faster than buddy breathing and easier than an octopus