> For the complete documentation index, see [llms.txt](https://docs.sevenpens.com/drawtab/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sevenpens.com/drawtab/tech/emr/active-emr-vs-passive-emr.md).

# Active EMR vs Passive EMR

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Modern EMR pens are **Passive EMR**. <mark style="color:red;">**DO NOT Buy a tablet that uses Active EMR**</mark>.
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## Overview

**Active** vs **Passive** indicates how an EMR pen gets power.

* Passive EMR - The tablet wirelessly powers the pen
* Active EMR - A battery inside the pen powers the pen

## Batteries for Active EMR pens

The battery may be replaceable or rechargeable.

## **Mixing and Matching**

It doesn't work.

* You cannot use an Active EMR pen with a Passive EMR tablet
* You cannot use a Passive EMR pen with an Active EMR tablet.

## Notes on Active EMR pens

Active EMR pens are EMR pens that are powered by an internal battery. The battery may be rechargeable or it may be replaceable. Passive EMR pens get their power from simply being near the tablet.

In principle, there is nothing wrong with an active EMR pen. Some people are quite happy with how they work and the drawing experience they offer.

However,

* Active EMR pens come from a generation when pens weren't anywhere near as good as they are now. These pens may have a much higher IAF than more modern pens.
* So, having an active EMR pen is an indicator that a tablet is using older tech.

Wacom has used passive EMR pens for about 40 years. However, non-Wacom brands used active EMR pens until about 2011. The reason for that timing is due to the expiration of some key Wacom patents.