This is a very good product. I was watching a movie while it was connected to my laptop. As other commenters have mentioned, the battery lasts 2 hours from a full charge even when plugged in. However, when connected to your smartphone, it will not be projected immediately. I had to unplug and plug my phone back in and several times the display was built into the projector, even though I changed the display on my phone it didn't change the display on the projector. I had to power cycle, disconnect and reconnect the projector multiple times and finally everything changed. I have an iPhone X, so I'm not sure if it works the same on other smartphones.
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