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Originally Posted by vostro
got 64G version which comes with premium version of pen, can't find if it's battery powered.
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two PW3 i have shows noticeable screen contrast difference with front light.
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There are two main kinds of Wacom pens, the original and the EMR. Both have electronics powered by the host digitiser system, either a plain tablet with no display or under the display. The Scribe uses the Wacom EMR, same as reMarkable, some Lenovo Laptops and some LCD/OLED tablets.
The Samsung S pens may be inductively charged, but I'm not sure. They don't take a battery.
Apple Pencil and MS Surface are incompatible and use batteries. Some MS Pens are rechargeable and some have BT also for One Note. The basic MS two button pen with no "One Note" BT seems identical to the Kobo Pen. I have the Kobo Pen and the cheap MS Surface compatible "Adrawpen" and no difference in use / performance. Cosmetically similar. The AAAA cell might last the quoted 6 months as I've not had to replace a cell (about 20c).
There may be other systems. Most, including both main kinds of Wacom (and pen on Kindle Scribe) are pressure sensitive but most applications use a threshold on pressure to turn on/off the digital ink, so will only reveal pressure with a suitable drawing app that can map pressure to density, or width or unlike the real world to hue. On Mac/PC/Linux you can use pressure to simulate quill, crayon, pencil, chalk, charcoal or pencil. Most Wacom don't do angle, but some other digitiser/stylus combos do, such as Apple Pencil, which can sort of simulate calligraphy.
Front light settings and the light pipe for a front light vary hugely even on the same model. I rely on a desk lamp, room lamp or daylight unless the available light is too poor when away from home.