Feature: 1. Stainless Steel Material: Interfaces adopt stainless steel as the material, so that the interfaces are durable, not easy to rust. 2. Powerful Tool: Special underwater generator for diving, installed between low pressure tube and air charging valve, driven by gas, sound decibels up to 125~130dB, can transmit about 1km, can call submersible partner in or above water, just press the button lightly to achieve the purpose. 3. Main Function: The function of the buzzer is to convey information through sound. Different from the single frequency buzzer, the dual frequency one can emit two kinds of frequency sounds. The high frequency is more penetrating and can be used for warning and calling for help. The low frequency buzzer is louder. 4. Button Description: Orange button which connects to BC inflatable tube is high frequency speaker, yellow button which connects to BCD is low frequency speaker 5. Easy to Use: Small in size and light in weight, both make the buzzer easy to carry and store, convenient to use. Specification: Item Type: Double Frequency Diving Buzzer Material: Stainless Steel Color: As Picture Shown Application: For Outdoor Activities, Underwater Sports Weight: Approx.213g/7.5oz. Package List: 1 x Buzzer Note: 1.Because the sound is loud, please press the buzzer away from the ear, otherwise there is a potential risk of hearing loss. 2.After each dive, clean it with water as soon as possible. If it is not thoroughly cleaned, it will affect the use efficiency of the diving buzzer, and avoid exposure to the sun.