UPDATED: The plug needed is a USB cord, it did not come with a block. After some testing it was the block that was not working, not the lamp.I loved this lamp when I received it! It was the perfect, size, brightness for my desk. After 2 months it just stopped working - even "fully charged". Return window has closed. I would expect a MUCH longer life for this lamp. Very disappointed.I very much like this lamp. It takes up little space, and has a little bit of space for storage. HOWEVER, writeup says "...battery power desk lamp charge for 4-5 hours and use for up to 64 hours..." and this is not true - NO WHERE NEAR 64 hours of use, in fact, it can be used for less than 2 hours :( My lamp will be fully charged (red light not blinking) and I will turn it on. After about 100 minutes, it goes off and begins blinking. Because the light is plugged in all of the time that I am using it, I expect it to continuously charge as the write up says. But it goes off and will not come back on until I have it plugged in for a considerable time to become fully charged (no blinking light). This is very annoying as if the light is plugged in and fully charged and I do not unplug it, it should continue to charge even if I am using it - as advertised to do.Could be brighterLoved this lamp used it weekly at my desk for about a year but now it doesn’t want to hold a charge at all. Shopping for a new lamp wish this one had lasted longer.When I first got it , the light worked great, but found out it turns off by itself. Only after I bought it did I find out that there is a lithium battery unit. Would not buy it again. So frustrated with unit. I nearly feel that it's possessed. Plugged in but still turns itself off 3 min later. NOT A GOOD DESK LAMP.I really liked this light - it was great for my desk. You can control the brightness and the positioning and can charge devices. Had great storage areas for paperclips, pens, etc. I bought it in November and it died in March. It turns on for 10 seconds and turns off immediately. It said there was a 1 year automatic warrantee, but there is literally no way to take advantage of it. I'm disappointed that it didn't last because I really liked the ideas it had.UPDATE = The company reached out to me, after seeing my review and offered to replace the lamp at no additional cost to me. I was very impressed that the seller took the time to reach out to make this right for me and that the replacement product is happily luminating my office so that I can do my work. Even if I have any further problems with the product, I would give the seller an A+ for ensuring that I was satisfied. Clearly if they take the time to read a review and reach out to me, they are conscientious and stand by their products and that is impressive to me.I particularly like the area that the light covers as well as the three settings that I use for different reasons. It is compact enough that it doesn't crowd my desk and light enough that I can move it around if I need to. All in all, I like it very much.This is, generally, a nice desk lamp. It came with no instructions. It's mostly intuitive and simple. It has one very annoying feature - when it is left on charge continuously it will turn off. It does not recognize operation continually connected to the power supply, apparently expecting all users to operate far away from power and only reconnecting to power when it is depleted. It is very aggravating! i have to disconnect and reconnect it several times a day.