you didnt specified what ecsactly you are doing, and how you are doing. i am not a lawyer, but you should not care about it until the point you start to mass-manufacture it in corporative manners. (by you shout not care, i meant, it should not shock people to death obviously). from that point you will have to worry about all the regulations, and to be precize, to regulations all contry individually have, becouse they may seem to be just compatible while even being in the same economic blocks, but in the reality its very divergent. if not you are directly the manufacturer and/or the seller, obtaining this compilance is not directly your task (besides the fact that you are may restrict yourself to comply with the limitations where it is your task).
for example in my contry they dont care what certifications are glued into the device or to the box, its totally ignored, instead the authorities randomly test random devices by random sampling from random manufacturers to check if they comply with the basic standards and laws, or not. such as it must be able to have electric shock protection up to a given sized electric spark, etc. if it not complys, then its being pulled off from the market, and a warning will be issued against using and buying such device. but this will be totally different from contry by contry.
so maybe just by trying to comply a logo you missing the point.