I am very impressed with this projector. Most people leaving bad reviews about the battery or what not don't really seem to understand or did not read what this projector can do. This projector works great for what it is. Now there are a few things about it that did not work well which is why I did not give it 5 stars.It is very nice to have a 1280 x 720 resolution but I don't really see the need to have your source set to 1920 x 1080 unless you are using a computer desktop or something. The image on this projector is much better than my big/cheap 3600 lumens projector that I have so that really surprised me. I do wish it was brighter but unless you want to spend $400+ for a projector of the same size, you wont get that. Even with it only being 50 lumens, it works really well in a dark room. Even with a few lights on its not too bad. I found you can project the image pretty large but of course the larger it is, the darker your room needs to be.I then tested the battery in several ways. At first I found it only ran for about 47 minutes which I thought was a little odd, especially with the description and their website saying 150 minutes. I realized that it had to be under certain circumstances. Sure enough I found in the fine print where it said that the150 minutes is only under ECO mode. I decided to test this to confirm and sure enough it ran for about 2 hours and 10 minutes which is pretty close. The 20 minute discrepancy is most likely due to when I first turned it on it was set to BRIGHT even though I had set it to ECO before I unplugged it.This brings me to one of the reasons for the reduced star. For some reason the brightness setting keeps changing on its own. I will set it to ECO and it seems to change back to BRIGHT randomly. After some testing, I found that while it is plugged in, it can only run in Standard and ECO mode. When its on battery, it can go Bright, Standard, and ECO. It seems that when it changes between external power and battery, it automatically sets to the highest one available. It really should stay on the setting you set it too unless the mode you changed too cant support it of course.For the USB/SD support, I tested several different types of drives that I had to see what would work and my conclusion was that it does not seem to have a size limit but it does seem very finicky on the drive itself. While some of my external drives or USB flash drives would work, others would not. I did find that FAT32 and NTFS is supported but not exFAT. I have made a spreadsheet of the different drives I tried and attached it as a image to this review if you want more info.Another reason for the reduced star is the power on/off feature is a little wonky. You can use the remote to turn it off, but the remote does not work to turn it on. My guess is when it is powered off, the IR receiver is also powered off which really should not be the case. Also the built in speaker is pretty much as expected. It really is useless so I suggest you use some kind of external speaker that can run on battery or USB power.For anyone interested, I purchased�Camera Monopod Removable Aluminum 70"" Camera Tripod with Pan-Head�for a tripod and it works great for this projector as it can provide tabletop support or a height of around 6 feet. I also purchased�Upgraded Pyle 40"" Portable Projector Screen�for a decent sized screen that is also very portable. Its not huge but enough for viewing which is what I wanted because I don't want to carry around a 20lb screen. I do wish there was a stand for it to increase the height but it is still a great screen so far.As for the power adapter, the ones that is sold for this projector is just too expensive. After some research, I first tried�USB Type C Charger, Quick Charge 3.0 Rapid Fast Wall Charger�for 12.99 which should have worked but it did not seem to be able to output enough power to allow the projector to run continuously. I then tried�[UL LISTED] Pwr+ 24W Quick Charge 3.0 USB Charger�fro $9.99 which I already had for something else and it worked perfectly. I did find that the projector will not charge while it is in use or at least it should not. Per the company it does not charge while you use it to protect the battery. That makes no sense to me but not much I can do about it.All in all I am very happy with this projector and would recommend it to anyone. If it were not for the few things I mentioned here, it would be 5 stars.