Remote shutters are Bluetooth devices that connect to your mobile phone or tablet allowing you to snap pictures via a handheld remote. You can take selfies sans your arm getting in the way, or group pictures without the uncertainty of a timer.
There are a variety of styles when it comes to remote shutters. Most shutters work up to 30ft away from your device. Some shutters come equipped with a stand to work with your device keeping it upright for picture taking. Some also come with lanyards or key chains to keep them close for when you need them.