We made these metal-detectable, just in case they fell into somewhere they shouldn’t be. As you can see, a cord keeps them together. On comms program, the wearer can use the t-coil neckloop with 3.5 jack into a phone or other audio device. The lower button allows the user to select desired volume in quiet environments. The upper button allows the user to select from 5 preset programs. The electronic insert can be removed and replaced with a passive blank. Another client uses the blanks when on his speed bike.