Afraid to swim in open water ?, use this self rescue bracelet

Many triathletes are respected for swimming in open water, as they already have an accessory with which they can be more secure, the self-rescue bracelet

This bracelet invented by the Chinese Wu Xuexing, Linghui Zhu Zhu and Peizheng works only by pulling the strap, which will cause the compressed air in the bracelet to swell rapidly to increase the swimmer's buoyancy.

Further information:  http://spanish.alibaba.com/product-gs/swimming-safety-self-rescue-bracelet-1595788251.html 

The user can use it as a bracelet, as it is very light and thin and does not interfere with the practice of swimming