# Shelly The Pill by Shelly

*Shelly / S3SN-0U53X*

> The Pill by Shelly is a small USB-C powered Wi-Fi and Bluetooth unit for temperature sensors and low-voltage inputs and outputs. Shelly states Gen3 capabilities for it. It suits Home Assistant users, with native support through local Wi-Fi control.

- Canonical page: https://smarthomecanon.com/devices/the-pill-by-shelly
- Last checked: 2026-10-20

## Key facts

| Fact | Value |
| --- | --- |
| Brand | [Shelly](https://smarthomecanon.com/brands/shelly) |
| Category | Relay module |
| Model numbers | S3SN-0U53X |
| Status | Current[^1][^2] |
| Generation | Gen3[^3] |
| Model code | S3SN-0U53X[^3] |
| What it does | Low-voltage unit for DS18B20 or DHT22 temperature sensing, digital inputs and outputs and an analog input[^3] |
| Works with | External sensors and peripheral add-ons (SSR, analog 0-30 V)[^3] |
| Connection | Wi-Fi 802.11 b/g/n, Bluetooth 4.2 (BLE)[^3] |
| Power | 5 V DC over USB-C[^3] |
| Local API | HTTP API, MQTT and webhooks[^3][^4] |

## Integration paths

**How the Shelly The Pill by Shelly connects**

| Path | Requires | Local | Features lost |
| --- | --- | --- | --- |
| [Wi-Fi local](https://smarthomecanon.com/protocols/wifi-local) | Nothing extra[^3] | Yes[^3] | unknown |

**Platform support for the Shelly The Pill by Shelly**

| Path | Platform | Support | Integration |
| --- | --- | --- | --- |
| Wi-Fi local | [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) | withheld | shelly |
| Wi-Fi local | [Homey](https://smarthomecanon.com/platforms/homey) | withheld | cloud.shelly.control |

## Related pages

- [Shelly add-ons and modules](https://smarthomecanon.com/lines/shelly-add-ons-and-modules) (line)
- [Shelly](https://smarthomecanon.com/brands/shelly) (brand)
- [Wi-Fi with local control](https://smarthomecanon.com/protocols/wifi-local) (protocol)
- [Home Assistant](https://smarthomecanon.com/platforms/home-assistant) (platform)
- [Homey](https://smarthomecanon.com/platforms/homey) (platform)

## Sources

[^1]: The Pill by Shelly - Shelly Europe shop. https://www.shelly.com/products/the-pill-by-shelly (manufacturer, checked 2026-10-13)
[^2]: Shelly Europe shop catalog (Shopify product feed, pages 1-3). https://www.shelly.com/products.json?limit=250&page=1 (manufacturer, checked 2026-10-13)
[^3]: The Pill by Shelly - Shelly Knowledge Base. https://kb.shelly.cloud/knowledge-base/the-pill-by-shelly (manufacturer, checked 2026-10-13)
[^4]: Shelly Technical Documentation: Gen2+ devices. https://shelly-api-docs.shelly.cloud/gen2/ (manufacturer, checked 2026-10-13)