great upgrade affordable and solid [SEP] i got this from amazon warehouse where it was open box but supposedly unused i do not know if that was true but the condition of my item is irrelevant to the review this is a great light it replaces both my uv bulb lamp and my led uv lampthis thing cures gelish and rcm so fast and my manis are lasting so much longer without lifting or chipping most of the time now i get bored or my nails grow too much before the polish even shows a hint of coming off the led placement is great and it cures all fingers at once with no trouble there is a bit of heat but it is minimal and i would be surprised if anyone found it painful i have not tried the low heat modethe sensor feature is nice i was under the impression that i could set the timer to or once and forget it but so far it seems like i have to choose a time every time if not it goes on until you remove your hand i have not gone over seconds so i am not sure how long it would go for but it definitely does not have a default shut off of as advertised my open box did not include a user manual i am hoping to find one onlinethe white of this model does not reflect as much light as those lined in silver but it still leaks a fair amount of light i would definitely advise using glasses or averting your eyes and make sure to keep kids away because even the reflected light can be painfully intenseit comes off the base for doing pedicures and while the magnetic components seem to work well and the pieces fit together nicely i do not polish my toes so i do not use this without the base