TIIIAIR is a sleep device — not any other kind of appliance — and you don’t wear anything. Plug it in, place it in the bedroom, and leave it on day and night. It does two things. The first is what every sleep device does: PM2.5 removal, formaldehyde removal, bacteria removal. The second is what most sleep devices don’t: releasing negative oxygen ions and the Schumann wave, turning the air from “clean but stuffy” into “clean and comfortable,” so you relax the moment you lie down.

Negative oxygen ions are negatively charged oxygen ions in the air. They’re abundant in forests, near waterfalls, and outdoors after rain — where people feel they breathe easier and unwind. TIIIAIR’s 500 million high-concentration negative oxygen ions bring that state into your bedroom: suspended particles settle, and your nose and throat stay comfortable as you breathe. Third-party test reports are available; ozone concentration is below 0.003 mg/m³, safe for the bedroom.

No. Low-noise air-duct design is one of TIIIAIR’s core technologies. The X35’s night mode measures from just 32 dB — quieter than an air conditioner’s airflow. At night, all you hear is breathing, never the machine.

Every 6–12 months depending on your environment. The machine reminds you when it’s time — no need to track dates yourself. Genuine filters are available in the official online store and flagship stores.

The whole unit carries a 1-year warranty, and the motor 3 years. Returns and exchanges follow mainstream e-commerce platform rules — no gimmicky “money-back” tricks. First and foremost, this is a sleep device whose cleaning performance is backed by published data. As for how it feels at night, it varies from person to person — some notice a difference within a week, others take longer. What we do is tune your bedroom environment to be better for sleep; we make no medical promises.