5 Best Underwater Signaling Devices (Reviews Updated 2022)

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When scuba diving, an underwater signaling device is your best bet to getting your buddy’s attention quickly when they’re focused on something else. For every scuba diver exploring the seas in the company of others, an underwater signaling device is essential so you can initiate communication and raise an alarm in the case of an emergency. The ideal underwater signaling device should be very handy, draw attention as much as possible, and should be reliable to work exactly when you need it.

Best Underwater Signalling Devices

To save you the hassle of sifting through countless products, we have compiled a list of our top five underwater signaling devices that pack a punch with exceptional functionality and great value for money.

1. Mares Magnetic Shaker

Mares Magnetic Shaker

The Mares magnetic features an innovative design using a ball bearing oscillating between two magnetic for repeated sound signals. It comes with a lanyard for easy attachment to your BCD and boasts of an impressive sound range. It is very lightweight, handy, and easy to use.

  • Innovative magnetic ball-bearing design.
  • Impressive sound range.
  • Easy to use and handle.
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2. Scubapro Shaker

Scubapro Shaker

The Scubapro Shaker is a handy, underwater rattler that boasts of an impressive decibel rating and sound range. It features a magnetic end-stopper that keeps it quiet when you want it to, a clip that attaches easily to your BCD for convenience, and a comfort-emphasized grip cord. It is compact, lightweight, and very easy to use.

  • Loud noise with impressive range.
  • Easy to use and control.
  • Convenient to use and highly portable.
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3. Trident Tank Banger

Trident Tank Banger

The Trident tank banger is another popular product among scuba divers and features a simple oval bang ball encircling a grip cord. It attaches easily to most scuba tanks and makes a loud noise with a simple pull on its banger. It comes in a variety of colors and is very affordable.

  • Simple design and affordable.
  • Easy to use and produces a loud noise.
  • Comes in a variety of colors.
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4. Innovative Water Activated Flashing Marker

Innovative Water Activated Flashing Marker

The Innovative flashing marker doesn’t use sound like most other underwater signaling devices, but light. It automatically switches on once you enter the water and off once you come out to save power, in a bright red glow for long-range visibility. It is highly reliable, comes with a lanyard, and boasts of up to 500 hours of glow time underwater.

  • Very convenient to use.
  • Superior visibility range and flashing mode for easy spotting.
  • Long battery life
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5. Dive Alert New Ideation Plus Version 2

Dive Alert New Ideation Plus Version 2

The Dive Alert New Ideation Plus V2 is one of the loudest underwater signaling devices on the market and attaches to your BCD power inflator. It can be used both on land and in the water and can produce sounds that can reach up to a mile away. It sports a durable, rigid design and is very convenient to use.

  • Superior loudness and reach.
  • Easy and convenient to use.
  • Very economic in air consumption.
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Underwater Signalling Devices Buying Guide

In the depths of the sea, where spoken words fail, underwater signaling devices are your talking aids. Whether to draw your partner’s attention to some beautiful marine life, keep tabs on each other’s positions, or raise an alarm for potential danger, these handy devices are a must-have in your safety gear.

We have reviewed the best underwater signaling devices on the market based on their specified features and customer feedback to help you streamline your choices. Now we will take it a step further and outline the factors you should consider when on the market for an underwater signaling device before making a purchase.

Signaling Medium

The medium through which the underwater signaling device attracts attention is a very important consideration to make. In general, underwater signaling devices use either sound or light as the medium. Most underwater signaling devices are of the sound type and boast of superb reliability as most of them don’t use any electronic components. Your buddy doesn’t have to be looking at you to attract his or her attention.

Underwater signaling devices that use light are becoming more popular among scuba divers. As the light produced can be seen from very far away, they are also a good buy. Note that with these, however, your buddy will have to be looking in your direction for them to notice you. Some hybrid underwater signaling devices combine sound and light transmission.

Size and Weight

When scuba diving, your gear should be as light as possible so you can move around easily. Your underwater signaling device undoubtedly falls under this category and should be as small and light as possible. It should be small enough to fit in your hands and attach easily to your BCD. For siren-style underwater signaling devices like the Dive Alert V2, the size of its sound port plays a direct role in its loudness and reach. The larger, the louder. In the end, it is about finding a balance between size and loudness.


If your underwater signaling device is going to last a long while, it must be made from the best materials. You want a device made from materials that can withstand impact and are highly corrosion-resistant.

Mechanical vs. Air Powered

Most sound-type underwater signaling devices are rattlers or tank bangers and produce sound when shaken or struck against your tank. However, some underwater signaling devices like the Dive Alert V2 attach directly to your BCD or tank to produce sound. The latter boast of superior loudness and sound reach and are ideal if you want a gadget that can be used both on land and in the water.