The mini phone holder comes in two versions: the version with the “d k” (the initial letters of “dual‑key,” referring to phones with cases) embossed on the top is designed for use with a phone case, while the version without any markings on the top is intended for bare‑device use. Each holder offers two adjustable angles; the top features two rectangular indicators—vertical rectangles indicate that the phone is best viewed when placed vertically in this slot, whereas horizontal rectangles suggest optimal viewing when the phone is positioned horizontally in the slot. For optimal viewing comfort, we recommend positioning the phone holder at a distance roughly equivalent to one forearm length from your eyes.