Very small! About the size of a coke can. Rechargeable and works instantly! I don't think this will fill my living room, dining room and kitchen with scents, but that is a huge open space. I will be using this in the office, bedroom and travel primarily.
I received it, pulled it out of the packaging and immediately put a little bit of peppermint oil in to see how well it works. Upon turning the device on, I could see the vapor coming out. I placed it in my office, about 170Sqft room, and it filled the whole room with the peppermint oil smell within 10-20 minutes. This is on the lowest setting. I will try putting it in the hallway next and see how well it does. I will be putting this in my truck and taking it with us on road trips and anytime we have to stay in a hotel room. My wife always says they stink and this should definitely change that!
Due to it being the size of a coke can, you can easily pack it or use it in the car. (It fits in the cup holder perfectly!) I would make sure to empty the oil before packing it though. You don't want that to leak and ruin anything. It is extremely quiet. I have it on the other side of my office and can hear when it kicks on, but it sounds about like a laptop fan. Even right next to it, the sound is so quiet, if you have music or a tv or anything on, you will probably never hear it.
I am new to the whole oil diffuser thing but am loving it! I can't tell you how fast this runs through oil yet, but I will come back and update my review if anything happens out of the ordinary.
This would be a great gift for the holidays or to help someone with relaxation as it fills a small space with whatever aroma oil you put into it. This says you CAN use carrier oil, so I guess if you add carrier oil (most diffusers I have been looking at say you can't), it will allow for your aroma oil to last longer. Due to this, I am wondering if I can use Reed oil, or if it will mess this diffuser up. I don't want to break it, but this oil gets expensive!
The manual says Resin and thick oil are not recommended. It also says not to use Agarwood, camphor tree, or dried orange peel oils.
I have no idea how long the battery will actually last, but the manual says it takes 4.5 hours to fully charge. Mine came charged (at least a bit) out of the box. There is no way to check the charge level, which is a bit of a pain. The device not having a battery meter is what caused the 1-star reduction. If you are making a device that only runs on rechargeable batteries, give the consumer a way to know how much battery life you have left. Imagine buying a cell phone that doesn't tell you how much battery is left. That would be crazy! How are you supposed to know when to charge this thing?!!
Overall, even with the lack of a battery meter, I would buy this device again.