Communication Equipment, Devices and Apparatus Design Underwater Transceiver Transmission Device by Divintok Technology pte.ltd Underwater Transceiver is a wireless voice communication device for scuba divers. The design uses underwater acoustic communication and consists of an underwater unit and a bite contact microphone. Divers press and hold the talk button to speak in real time, and sessions between several devices are supported. An indicator ring shows the device status and helps locate the diver. A heat and corrosion resistant casing improves sealing. The unit works to a depth of 50 metres, transmits up to 75 metres and runs for up to 4 hours.