Your HTC One comes enabled with an IR Blaster located behind the power button. It works great as a universal remote for your TV (seriously - try it!), but now you can extend that use to your digital camera as well!
Pro, enthusiast, or amateur: chances are, if your camera is on you, your cell phone is not too far away. And since the IR capability is built right into your HTC One, that means there is nothing else to carry!