Comes with two AAA batteries Pocket clip Tail-cap switch EMI&';s Ultra-Light Pupil Gauge Penlight now comes in your choice of three striking colors- metallic red, blue or black. The penlight is activated by depressing its tail-cap switch.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }