Automatically Inflatable lifejacket, Hitch Type/Single Air Chamber. It is designed and produced according to EN396/A1:1998  and relative requirements of MSC.81(70). CE approved by Germanischer Liyod AG. It consists of one air chamber made of TPU nylon composite material, auto inflation device, manual inflation device, retro reflective tape,CO2 cylinder and oral tube. In emergent situation when falling into water, it can be inflated by the auto inflation device within five seconds or by manually pulling the toggle so as to ensure safety of the drowning people(ZHGQYT-0521 can only be inflated manually). The main parameters:1)Weight less than 1kg;2) Buoyancy>150N 3)Angle in water: face plane angle>40 degree, trunk angle>30 degree.4)Freeboard>120mm. 5)Inflation time less than 5s. 6) float duration>24h 7)Buoyancy loss after 24h less than 5%. 8)CO2 Weight: 33g. 9) Ambient temperature for use: -30 C ~ +65 C   10 ) Validity: 3 years