Probably the single most important piece of equipment I own are my Bose QC20i headphones (and the iPhone 6 they are usually attached to). As an introvert who is sensitive to external noises, it helps me gain a little control over my environment. Next most important is my Apple iPad Air 2. Unless I am going out for food or a stroll with my husband, my iPad is probably with me. I do almost all of my scientific publication reading on it, using my Maglus Stylus to make annotations. My Maglus really completes the setup.