Performance:
1) Buoyance at water is more than 140N to support 1 man in the water
2) Easy to secure around a patient Application field:
1) For lifeguards at sea river, sea shore as effective rescue tool when someone is found with falling into water or sinking
2) For surfing, swimming at river, lake, sea shore to provide guard in the case of suddenly getting cramp, or completely exhausted
3) Equipped to boat, safety patrol vehicles, or located at some area as quick water rescue tools