The Onyx M-24 inflatable life jacket provides Manual inflation where the wearer pulls the inflation handle to provide flotation. Equipped with back-up oral inflation. Provides comfort, safety and peace of mind without knowing you have it on, until you may need it. Lightweight, low profile design. Durable fabric resists tears and punctures. Always read your Owner's Manual for the proper way to initially arm your life jacket with the CO2 cartridge, and how to re-arm it after it's been inflated.