Are all of these cool-mist? Yes. All three are cool-mist ultrasonic diffusers with no heating element, so there is no boiling water and no burn risk, and each has an auto shut-off when the tank runs dry.
Can I put any essential oil in them? No. Use only SOSA's water-based Hotel Collection fragrance. Raw essential oils and carrier oils are too thick and can clog the ultrasonic misting plate and damage the unit.
Matching a diffuser to your room
The mistake I see most often is buying a tiny gadget diffuser for a big room, then wondering why it quits by midnight and never really scents the space. Tank size and coverage are the two numbers that matter.
For a desk, bedside or hostel bunk, the Boond is deliberately small - a 300ml tank, USB-powered, whisper-quiet, with a soft colour night light. It covers roughly 150 sq ft and runs up to six hours, which is a work session or a bedtime wind-down. It has no remote and no timer, and at ₹799 it is my go-to gift and first diffuser.
For a bedroom, study or nursery, the Sukoon is the sweet spot. A 500ml tank runs 16-18 hours on low, so it lasts the whole night, and it covers 270-320 sq ft. The 7-colour LED works as a mood light or a night light, the remote lets you set it from bed, and the steady/2H/4H timers mean you can drift off without getting up. It is made from BPA-free ABS, which is why parents choose it for a child's room.
A useful rule of thumb: match runtime to how long you actually want scent. If you want an all-night bedroom, the Boond will run dry before morning - go Sukoon. If you want a room humidified for days at a stretch through a dry winter, only the 6L Megh will do it without daily refills.
For a living room, an open-plan space or a room left parched by the AC, the Megh is the workhorse. Six litres of water, an adjustable mist dial from a gentle trickle to a strong plume, around 35 dB so it fades into the background, and up to 100 hours on a fill. It has no LED light and no remote - just one honest dial - because it is built to humidify and diffuse a big room, not to be a night light.
The one fragrance rule
Whichever diffuser you pick, this is the rule I repeat on every listing: use only SOSA's water-based Hotel Collection fragrance. These are ultrasonic units - a plate vibrates thousands of times a second to turn water into a cool mist, and a few drops of water-based fragrance ride that mist cleanly. Raw essential oils, neat perfumes and carrier oils are too thick or too solvent-heavy; they sit on the plate, clog it and can damage the unit.
Water-based fragrance dissolves into the tank water and mists out with it. A raw oil floats, coats the misting plate and gums it up. That is the whole reason SOSA ships a water-based Hotel Collection rather than a bottle of essential oil.
Two more habits keep any ultrasonic diffuser healthy: use clean, room-temperature water - filtered or RO in hard-water cities to avoid the white mineral dust that hard water leaves - and never pour in hot water. Add a few drops of your chosen Hotel Collection scent, top up with water, and that is it. Each diffuser arrives with three of these fragrances, so you are scenting from day one.
The SOSA range
SOSA makes three cool-mist ultrasonic diffusers for different rooms, each arriving with three of our water-based Hotel Collection fragrances so you can scent from day one. Prices and headline specs below are live from the SOSA store. Whichever you choose, use only the SOSA water-based fragrance - raw essential or carrier oils can clog the misting plate.
| Diffuser / refill | Character | Best for | From |
|---|---|---|---|
| Boond (300ml mini) | USB · up to 6 hrs · colour night light · ~150 sq ft | Desk, bedside, hostel | ₹799 |
| Sukoon (500ml) | 16-18 hrs · 7-colour LED · remote + 2H/4H timers · 270-320 sq ft | Bedroom, study, nursery | ₹1799 |
| Megh (6L) | Up to 100 hrs · adjustable mist dial · ~35 dB · large-room humidifier | Living room, dry AC, winter | ₹3499 |
| Hotel Collection fragrance | Water-based refill · 7 hotel-inspired scents · 15/100/300ml | Refill for any SOSA diffuser | ₹299 |
Versailles
I trained as a perfumer at ISIPCA in Versailles, but half the questions we get are not about scent at all - they are about the machine. Indian rooms are bone-dry from AC and winter, and most gadget diffusers are too small, too loud, or quit by midnight. So we made three: Boond (300ml, desk), Sukoon (500ml, bedroom, with a remote and mood light) and Megh (6L, whole-room), each shipping with three of our fragrances.
They are cool-mist ultrasonic diffusers - an ultrasonic plate turns water into a fine, cool mist with no heating element, so there is no boiling water or burn risk, and each has an auto shut-off when the tank runs dry.
One thing I say on every listing and will say here: use only SOSA's water-based Hotel Collection fragrance. Raw essential oils, perfumes and carrier oils are thick or solvent-heavy and can clog the misting plate and damage the unit. A few drops of our water-based fragrance in the tank mists cleanly and scents the whole room.
Frequently asked questions
Facts verified June 2026: SOSA makes three cool-mist ultrasonic diffusers: Boond (300ml, USB, colour night light, up to 6 hrs, ~150 sq ft, ₹799), Sukoon (500ml, 7-colour LED, remote + 2H/4H timers, up to 16-18 hrs, 270-320 sq ft, BPA-free, ₹1799) and Megh (6L, adjustable mist dial, ~35 dB, up to 100 hrs, ₹3499). Each is cool mist (no heating element) with auto shut-off, ships with 3 water-based Hotel Collection fragrances (15ml ₹299 / 100ml ₹999 / 300ml ₹1799), and is made for Indian AC-dry and winter air. Use SOSA water-based fragrance only; raw essential or carrier oils can clog the ultrasonic misting plate. Composed in India; a portion of every order supports Nanhi Kali girl-child education. These are independent, hotel-inspired fragrance interpretations created by SOSA. SOSA is not affiliated with, endorsed by or associated with the hotels named; all hotel names are trademarks of their respective owners and are used only to describe the scent style.