Fig. 2
Front view of the box: (a) showing the magnet, the LED flashlight covered with the blue light filter, (b) showing the fingertip aperture and the smartphone box from the user side.
Fig. 2 | Scientific Reports
Front view of the box: (a) showing the magnet, the LED flashlight covered with the blue light filter, (b) showing the fingertip aperture and the smartphone box from the user side.
