The Snappgrip is a fantastic idea, with not-too-bad hardware to back it up. It’s an accessory grip for your iPhone that adds a Bluetooth shutter release, zoom buttons and control dial to the phone’s camera, as well as a wrist strap and a handy handgrip.
But in practice, you’ll be better off with the iPhone’s own volume switches if you want a hardware shutter release. Which is a shame, as I was super-excited to try the Snappgrip out.