Flexibility 3 rotatable interfaces:The adjustable arm built of steel springs and tension control knobs, can extend height and provides a broader range of lighting.No longer need to move your books or notebooks around to get it in the light at night.You can adjust the lighting angle as you want.Solid lamp base:This desk lamp is make in a iron lamp base, high quality and solid.Specification:With plug: YesLight source type: E27Bulb include yes or no: noSwitch type: on/off switchLampshade material: IronLamp body material: IronWide application : living room, study, bedroom, reading room or other places.