aXtion Night Run Armband for Small Smartphones. Up to 4.9" Sreen size (Up to 4.87" x 2.32" x .37") Yellow. Keep your night run safe and fun with an aXtion Night Run Armband from The Joy Factory. With reflective styling and a knob for securing your extra headphone cables this armband will help keep you visible at night while keeping your headphone cables out of the way.