The Helicopter Emergency Egress Device 3 (HEED 3).
The HEED 3 is a refillable fully self contained breathing device. The included Dial Gauge displays an accurate pressure reading in increments of 200 psi. Store the HEED 3 at full pressure and refill it only if you use it. The always-on regulator is ready to deliver life-saving air in an underwater emergency or toxic air environment.