These ear phones use air tubes to transmit the sound rather than the old standard electromagnetic circuits . They come in two variants one with the standard jack plug fitting and one with USB C fitting. Compatible with most devices. Built in microphone for phone calls and voice recording.
 
Normal wired headphones have electric and magnetic fields in the earpiece, and when connected to a phone or other transmitting device, there are transient radio frequencies will also travel on the wires. 
 
Other wireless headphones or ear pods use Bluetooth to transmit the audio. These earphones pass high frequency into the ear, around the head and body as they connect to a phone or other device.
 
These ear phones eliminate all high frequencies, magnetic fields and electric fields in the ear. This is another little step in reducing your EMF footprint.
 
Type C fitting is not compatible with Samsung phones and devices.
 
To fit the standard jack plug type to an IPhone you will need the adaptor here https://www.emfshop.co.nz/product-page/headphone-adapter-phone