If you have been looking for an affordable but reliable communication system for you and your diving partners, this system is the perfect choice. The OTS Buddy Phone was designed as an easy to operate, one channel, ultrasonic transceiver. The state-of-the-art digital circuitry ensures excellent performance. A built in factor set squelch helps eliminate man made, or marine background noise. It operates on one single 9 volt battery giving you hours of operations. The push-to-talk control (PTT) allows for simple transmission and no false triggering. Range in good conditions can be out to 500 meters! The Buddy Phone was tested and approved by the United States Navy and is used throughout the world by Military, Law Enforcement and Sport divers. If you are looking for a simple to use, good sounding system, the Buddy Phone is for you! This kit includeds the Guardian Full Face Mask. A common problem with most FFM on the market today is the seal. The lack of a good seal causes the diver to use air quicker and can interfere with the divers ability to hear if using underwater communications. With that in mind, the GFFM was designed around a double seal allowing for the comfort of both small and large faces. Equalizing is a challenge for all full face masks one size does not fit all. In order to ensure everyone can equalize, we have put together an Equalizing Kit, which comes with every Guardian full-face mask. The kit consists of two bases. One is a standard size without any holes. It can be adjusted up or down to fit as necessary. The other base has two holes, which allow for different size pads that can be added. In the event the standard base does not work for you, one of the pads and the other base should fit the bill. The Guardians low profile allows superb visibility and its easily removable 2nd stage regulator works great for storage and easy maintenance.