> For the complete documentation index, see [llms.txt](https://docs.senstream.com/senstream-researcher-ring-application-user-guide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.senstream.com/senstream-researcher-ring-application-user-guide/senstream-research-ring/senstream-research-ring-overview.md).

# Senstream Research Ring Overview

### Included Hardware

The Senstream Ring comes with a USB charging cable and ring sizing shims (6-13)

<figure><img src="https://1269099890-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTbF0CSiQwottzSBUH4wc%2Fuploads%2FvKelu5P5DM7MflxFuoLj%2F4.2_ring_overview-0.jpg?alt=media&amp;token=b7539025-c612-4214-89ce-3c5e287033d1" alt=""><figcaption></figcaption></figure>

### Sensor Locations

The Senstream ring contains:

* 3 ECG electrodes (2 inner, 1 outer)
* 2 EDA electrodes
* Optical PPG sensor.

<figure><img src="https://1269099890-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTbF0CSiQwottzSBUH4wc%2Fuploads%2FKcjDWFQGjr44gbSjgGIc%2F4.2_ring_overview-1.png?alt=media&amp;token=2ba73471-9f15-465d-b94d-c419eed9e3ee" alt=""><figcaption></figcaption></figure>

### Dimensions

<figure><img src="https://1269099890-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FTbF0CSiQwottzSBUH4wc%2Fuploads%2FjoXiJtjDqXO7uSoZiux0%2F4.3_ring_overview-2_dim.png?alt=media&amp;token=6e580d7a-d48a-4972-b9b6-11fb10dfb69a" alt=""><figcaption></figcaption></figure>