What it is:A consumable replacement energy delivery lamp for the Silk'n(TM) SensEpil.What it does:Silk'n(TM) SensEpil Disposable Lamp Cartridge can deliver 750 light pulses that typically cover two legs, arms, under arms, and bikini line. Energy intensity is determined only according to the energy level setting of the device. There is no decrease of energy during the usable lifetime of the cartridge. When a disposable lamp cartridge has reached 90 percent of its possible lifetime, the replace cartridge indicator light on the control panel will start blinking, indicating that the disposable lamp cartridge should soon be replaced.What else you need to know:Silk'n SensEpil(TM) is an over-the-counter innovation that delivers the clinically proven effectiveness of the well-established, market-leading Silk'n(TM) sold by physicians. This breakthrough product harnesses the power of proprietary Home Pulsed Light(TM) (HPL(TM)) technology to create a cutting-edge, safe, user-friendly hair-eliminating solution. Look no further if you want a quick, gentle, safe, and affordable way to diminish unwanted body hair. This must-have device and replacement cartridges provide a lifetime of personal treatments at a fraction of the cost of physician office visits.Safety Information:It is designed for use on legs, arms, underarms, bikini lines, and other areas of the body where hair removal is desired; it is not recommended for use on the face. This tool is ideal for use with lighter skin tones (I - IV on the Fitzpatrick Skin Tone Classification Scale) and brown-to-black hair. See the chart>