So how to use it, just open your iPhone’s camera app, ready your shot, and click the volume up button of your headphone to click the photos. If you have a Bluetooth headset with volume control, it’ll likely work with that, too. Any Bluetooth headset paired with the iPhone can be used in a similar manner to the wired headphones to take a photo.
If you are using the Bluetooth headset, this is perfect for taking photos on trips without having to use a camera app with a timer. Just attach your iPhone to a tripod and use your bluetooth headset volume + button as self timer remote to click the pictures.