RuiLinXin Book Light, Black Flat-panel Reading Lamp Reading Lights Night Light for Reading Size: 14.8x17.6x1.5 cm 4 AAA batteries are required to power the light for up to 40 hours; batteries are not included Reading with no light escaping to bother sleepers or neighbors close by A page-sized acrylic lens lays flat on the page while two bright LEDs shine discreetly where it's needed