The device uses independent licence-free radio frequencies and each unit can send and receive data. Depth rated to 100m, the Ray also features an underwater depth-gauge, timer and digital compass, and can transmit surface speed information. Internal USB-chargeable power cells are said to deliver a transmission time of up to 15 hours. The Ray comes in a twin pack priced at 1174 euros.

www.bluelocar.com

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