DEX accessories extend and enhance the features of Widex hearing aids. These accessories include PHONE-DEX (use with landline phones), TV-DEX (TV), FM+Dex (streaming audio), COM-DEX (mobile phones and Bluetooth devices) and CALL-Dex (discreet streaming from mobile phones), among others. The cost of DEX accessories range from $85 to $275, and all come with a one-year repair warranty.