The nail dryer Mini is equipped with a small fan and battery operated. It is very compact and convenient. I have small hands so it suits me. It is equipped with a push to activate the fan, I wish I had also a button on / off to avoid having to press the push ... It reduces drying time: counting a few minutes for drying polish (with a top coat speed dry). A bit expensive compared to the cost of manufacture for this type of product. But I find it handy so ....