PhoneBuddy™ headphones from Custom Protect Ear are compatible to dB Blockers and work with many smart phones. PhoneBuddy™ I is a single version headphone for monaural use (phone calls and to hear the phone ring in noise). PhoneBuddy™ II is the stereo version, allowing the user to listen to music and answer calls. Both units work with virtually any smart phone and feature an inline microphone and flash button. Custom Protect Ear,www.protectear.com, (800) 520-0220.