The Draeger BG-4, 4-hour closed-circuit breathing apparatus gives officers the advantage to save time, energy and most importantly lives. The Draeger BG-4 is a lightweight unit, which provides the needed duration for rescue and work environments. The ergonomically shaped carrying frame in conjunction with a strong, abrasion-resistant and strength-padded harness system, ensures wearing comfort. Even when wearing gloves, donning and doffing the BG-4 is easy, due to the larger low friction buckles. The flow-sensitive CO2 absorber, low breathing resistance and the integrated breathing air-cooling system reduces stress to the user. The BG-4 incorporates the Sentinel, a fully electronic alarm, test and pressure display. The BG-4 can be quickly prepared for reuse once a mission is completed.