XS Scuba - Wind Storm™ Safety Whistle TUSA Add Duo Air 2 This provides two benefits:

This provides two benefits:

Use the Hs on the webbing to line up on each side to ensure the perfect fit

System of Measurement Metric - Imperial

the Duo integrates an extremely sturdy tempered safety glass lens that stands up to continued wear and abrasion

XS Scuba - Wind Storm™ Safety Whistle TUSA Add Duo Air 2 This provides two benefits:The Wind Storm whistles outperform all of the other leading brands of whistles. It even works underwater, up to 50 ft (15. 25 m). Performs in all conditions, in any weather Can be heard on land up to 1 2 mile (804 m) away! Can be heard underwater for a distance of up to 50 ft (15. 25 m)! SOLAS Coast Guard approved