The Dell Active Pen PN557W uses two tiny button cell batteries. They are hard to install and the magnet in the end often flips them around as you go to screw it
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Dell Active Pen PN557W User's Guide
Dell Active PN557W Pen Unboxing and Review incl Jitter Line Test (Krita) - YouTube
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Setting up your Dell Active Stylus Pen (PN557W) - YouTube
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Essential mobile accessories for your Latitude 7390 2-in-1
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