The Flash&Go Replacement Cartridge is a disposable lamp cartridge designed specifically for the Flash&Go Hair Removal Home Pulsed Light™ device.Each lamp cartridge includes a built-in sensor to detect individual skin tones, eliminating guesswork and adding safety during treatment. If skin tones are darker than allowable, the applicator will not flash, thereby providing you a safe, at-home hair removal experience. Each lamp cartridge delivers 1,000 pulses for various body areas in need of hair removal, including legs, arms, underarms, chin and bikini line.