3-diopter acrylic magnifier lens enlarges 1.75 times. Magnifier lens includes built-in high power 5-diopter mini lens for additional magnification. Small details and fine print are read with greater comfort and ease. Versatile design includes interchangeable desk base and mounting clamp. Metal arm features gooseneck joints at base and shade for maximum flexibility in positioning. On/off switch conveniently located on base of arm. 6 3/4" round desk base features recessed design for holding clips, coins and other sundries. 5.4 watt surface-mount LEDs have an average rated life of 20,000 hours. Flip up lens cover protects magnifier lens from dust and scratches when not in use. AC adapter includes 70" long cord.