I have already paid the device 420 and at the time it was little expensive ... The cartridges are just too expensive and frankly I doubt that the number of flashes is waiting for you ... I did one session yesterday, arms, bikini line, legs and already I to 80%, I'm not gone several times to the areas ... So I think we are very far off ... as no one will have fun as I evaluated all the same and if I consider that I have already toasted 1/4 of the lamp in a session it comes back really expensive ...