Why you need it Provides an immediate, audible alert underwater and at the surface so you can get attention fast in urgent situations. Eliminates uncertainty when signaling buddies: clear, repeatable sound that travels through water better than voice. Attaches securely to standard snorkeling and diving gear so it’s always within reach. Key benefits and problem-solving Loud, unmistakable signal: steel balls inside the aluminum cylinder create a clear rattle when knocked or shaken, allowing quick, reliable communication without electronics. Easy to carry and deploy: includes a clip plus a 360-degree rotating quick hook and a quick-release hook so you can hang it on BCDs, weight belts, snorkel straps, or harnesses and retrieve it instantly. Durable and low-maintenance: made of lightweight aluminum alloy that resists rust and wear, built for repeated use in saltwater and freshwater environments. Consistent performance: robust construction maintains function under typical underwater pressure and ambient noise, giving you confidence during every dive or snorkel. Features and specifications Signaling method: knock or shake the cylinder; internal steel balls produce the sound. Mounting: clip, 360-degree rotating quick hook, and quick-release hook for secure, flexible attachment to diving or snorkeling gear. Material: lightweight, corrosion-resistant aluminum alloy body with steel ball rattle mechanism. Intended user: adults; designed for use with snorkeling and diving equipment. Durability: wear-resistant design suitable for long-term use in marine conditions. Practical use scenarios Group snorkeling: Quickly get the attention of a buddy group to point out marine life, change direction, or regroup without surfacing. Scuba diving: Signal a dive partner when visibility is reduced or when you need to indicate a direction or raise an objection safely and quietly underwater. Surface emergency or urgent alert: Attach to your gear so you can produce a loud, recognizable sound to attract attention from boats or nearby support if you need immediate help. What makes it stand out Mechanical, non-electronic design means no batteries or electronics to fail. Multiple attachment options (clip + rotating quick hook + quick-release hook) offer greater compatibility with common dive and snorkel setups. Lightweight aluminum alloy construction balances durability and portability for routine use. Included functions (consistent with original product) Audible rattle signal via steel balls inside the cylinder. Clip, 360-degree rotating quick hook, and quick-release hook for mounting. Lightweight aluminum alloy construction for rust resistance and longevity. Simple to use, reliable in the water, and compatible with most adult snorkeling and diving gear — designed to be a practical, durable signaling tool for underwater and surface use.