✅ WORLD LEADING AIR TUBE TECHNOLOGY → DefenderShield EMF-Free airtube headset delivers acoustic, signal-free sound to your head & ears, instead of wireless or Bluetooth, or even fully wired earbuds that put an electromagnetic signal by your head. | ✅ CRYSTAL CLEAR SOUND QUALITY → Engineered advanced stereo speakers offer high fidelity acoustic sound via hollow air tubes. | ✅ ENHANCED ELF SHIELDING → Tangle-free braided nylon cord is infused with copper for to block Extremely Low Frequency (ELF) electrical signals. | ✅ OTHER FEATURES → Built-in microphone w/audio control, 3 sizes of silicone ear tips, interchangeable sports tips and a clip to keep earphones secure for runs. Compatible with all 3.5mm jack devices (some devices may require additional adapter such as lightning cord or USB-C cable). | ✅ COMPATIBLE WITH ALL 3.5MM JACK DEVICES → iPhones will need a lightning adapter, some other phones and devices may require an additional adapter