I’ve been using this trigger for about 5 years now and it is a wonderful bit of kit. All of my lighting photographs have been captured using this device plus most of my astro and long exposure shots too. Once you set it via your phone over bluetooth you can walk away and leave it to get on with the job in hand, there’s no need to keep your phone switched on. A how-to guide is available here
It is more expensive than a simple wired intervalometer but it opens up a whole new world of photography and it’s only your imagination which will hold you back.
STILLS. TIMELAPSE. STARTRAIL. HDR. VIDEO. SOUND. LASER. LIGHTNING. PROXIMITY. DROPLET. SHAKE. SMILE. MOTION.