OTS XT-100 Buddy Phone The patented XT-100 Buddy Phone® transceiver has been specifically designed as an acoustic underwater telephone for the Sport Diver. It uses ultrasonic upper single side band for transmission. The diver utilizes his own face mask and 2nd stage regulator. The XT-100 Buddy Phone® comes complete with a HM-2 black silicone mouth mask. Your second stage regulator easily installs to the HM-2 mouth mask. The HM-2 mouth mask has a patented HotMic® studio quality, water proof microphone installed, a comfortable head strap and a unique push-to-talk system. When the diver enters the water, the XT-100 powers up and cycles to the receive mode - ready to receive a message. When the diver wants to transmit, they simply depress the PTT button located on the HM-2 and talk. All divers and/or surface stations within range and on the same frequency will hear the message. Top of the line underwater communication unit These Units Have Never Been In The Water!!! 50 to 500 meters of range depending on Sea Conditions and noise levels (see Sea Conditions) Ceramic earphones with dynamic depth compensation Operating Depth up to 130 feet of sea water. Alkaline 9 volt "transistor" type, OTS special high energy NiMH 9.6 volt rechargeable Battery. (RBN-9H) Get both units for $1099.95 OR $599.00 Each!