PRODUCT DETAILS This replacement Silk'n Flash & Go lamp cartridge has a unique built-in sensor, and this intelligent sensor that will detect naturally darker skin tones and will not allow the applicator to flash, adding safety to the already easy-to-use Home Pulsed Light device. PRODUCT FEATURES Replacement cartridge (one) For use with the Silk'n Flash & Go hair removal device. Each lamp cartridge holds 120,000 pulses, which are a lifetime of treatments for small areas including the more sensitive bikini line. Each lamp cartridge has a unique built-in sensor to detect naturally darker skin tones to not allow the applicator to flash for safety reasons. How to Use Treatment Schedule: For the first four sessions, treat each area once every two weeks. After the fourth session, treat each area once a month or as hair grows, until the area is completely free of hair. Most women will need to six to eight treatment sessions for permanent results, while most men will need an average of eight to ten sessions. PRODUCT DETAILS Includes: one replacement lamp cartridge Style no. 13587930 Due to its contents, this product cannot be shipped via our Priority Service or sent to Alaska, Hawaii, P.O. boxes, and/or APO/FPO military addresses.