One good, up-to-date, home-built desktop computer, one ancient laptop that belongs to me, one even older laptop that belongs to Mum, my IPad Mini, Mum's IPad Mini, my IPhone 4S, and my IPod Touch. I usually carry both iPhone and iPod everywhere, since I listen to audiobooks and podcasts nearly constantly when I'm out of the house. The constant auditory input helps me manage sensory sensitivities and focus on something besides my chronic back pain. I broke my back six years ago and that left me with nerve damage, spasticity, and spinal arthritis. I can walk further with less pain if I have an audiobook to focus on.
I value my computers and other gadgets more than almost anything else, and since I don't make a lot and can't afford to buy new ones, I take exquisite care of the devices I have, upgrade the hardware on my desktop when I need to and when I can afford to, and am very vigilant about viruses and other malware. I work on the desktop and laptops myself.