> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sonohealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Smart Features Overview

> AirPro smart features: lifetime filter tracking, Night Mode at 25 dB, Smart Timer, 360-degree airflow, and aromatherapy pad for essential oils.

The AirPro includes several smart features designed to make air purification effortless. From automatic filter monitoring to whisper-quiet night operation, each feature is built to simplify daily use.

## Smart Lifetime Filter Tracking

The AirPro continuously monitors filter usage and air quality conditions to track the remaining life of your filter. Instead of guessing when to replace the filter or relying on a simple calendar countdown, the smart tracking system accounts for actual operating conditions.

### How It Works

* The system tracks cumulative run time across all fan speed settings
* It monitors air quality conditions that affect filter wear
* A built-in indicator alerts you when the filter is approaching end of life
* No guesswork -- you replace the filter when the system says it is time, not before

This is more accurate than a fixed schedule because filter life depends on usage. A purifier running 24/7 in a dusty environment will exhaust its filter faster than one running a few hours a day in a clean room. The smart tracking adjusts accordingly.

### Why It Matters

Replacing filters too early wastes money. Replacing them too late means reduced filtration efficiency and potential strain on the motor. Smart tracking ensures you replace the filter at the right time -- typically between 6 and 12 months depending on your usage and environment.

## Night Mode

Night Mode reduces the AirPro's operating noise to **25 dB** -- quieter than a whisper. For reference:

| Sound                     | Decibel Level |
| ------------------------- | ------------- |
| Breathing                 | 10 dB         |
| Rustling leaves           | 20 dB         |
| **AirPro Night Mode**     | **25 dB**     |
| Whisper                   | 30 dB         |
| Library                   | 40 dB         |
| AirPro standard operation | 25-50 dB      |
| Normal conversation       | 60 dB         |

At 25 dB, the AirPro is virtually inaudible during sleep. Night Mode is ideal for bedrooms, nurseries, and any space where noise sensitivity is a concern.

## Smart Timer

The Smart Timer lets you set the AirPro to run for a specific duration and then automatically shut off. Three settings are available:

| Setting     | Best For                                                                  |
| ----------- | ------------------------------------------------------------------------- |
| **2 hours** | Quick air cleaning after cooking, before guests arrive, or before bedtime |
| **4 hours** | Covering a sleep cycle or an afternoon work session                       |
| **6 hours** | Extended overnight cleaning or all-day coverage while away                |

The timer is useful for energy-conscious users who do not want to run the purifier continuously. It also helps when you want targeted cleaning -- for example, running the purifier for 2 hours after cooking to clear smoke and odors, then letting it shut off automatically.

For rooms with persistent air quality issues (pet areas, rooms with new furniture, or spaces prone to mold), continuous operation without the timer provides the most consistent results.

## 360-Degree Airflow Design

The AirPro's cylindrical design draws air inward from all directions simultaneously. Air enters through 360 degrees around the base and sides, passes through the filtration stages, and exits upward through the top outlet.

### Advantages Over Directional Purifiers

* **No dead zones** -- Every part of the room receives airflow regardless of purifier orientation
* **Flexible placement** -- No need to aim the intake at a specific area
* **Faster coverage** -- 430 sq ft cleaned in 10 minutes due to omnidirectional intake
* **No wall-facing requirement** -- Traditional purifiers need the intake pointed away from walls; the AirPro works from any position

## Aromatherapy Pad

The AirPro includes a built-in aromatherapy pad where you can add essential oils. As purified air passes through the pad, it carries a light scent into the room.

### Using the Aromatherapy Feature

* Add a few drops of your preferred essential oil to the aromatherapy pad
* The pad is accessible without disassembling the unit
* Replace or refresh the pad as needed
* Use is entirely optional -- the purifier functions the same with or without essential oils

### Popular Essential Oil Uses

| Oil        | Common Use                     |
| ---------- | ------------------------------ |
| Lavender   | Relaxation, sleep support      |
| Eucalyptus | Respiratory comfort, freshness |
| Peppermint | Alertness, focus               |
| Tea tree   | Antimicrobial properties       |
| Lemon      | Clean, fresh scent             |

The aromatherapy pad distributes scent through the purifier's airflow, providing more even coverage than a standalone diffuser. Since the air has already been filtered, the essential oil mixes with clean air rather than recirculating with pollutants.

## Feature Summary

| Feature                 | Benefit                                                          |
| ----------------------- | ---------------------------------------------------------------- |
| Smart Lifetime Tracking | Replace filters at the right time -- not too early, not too late |
| Night Mode (25 dB)      | Whisper-quiet operation for undisturbed sleep                    |
| Smart Timer (2/4/6 hr)  | Set-and-forget operation with automatic shutoff                  |
| 360-Degree Airflow      | Full room coverage from any placement position                   |
| Aromatherapy Pad        | Add essential oils for a customized scent with clean air         |

***

**Related:** [Product Overview](/air-purifier/overview) · [Room Coverage Guide](/air-purifier/room-coverage) · [Filter Replacement Guide](/air-purifier/filter-replacement)