I like this cleansing device because it is waterproof and is made of silicone, which I find to be cleaner that the replaceable brush system type cleaners. Silicone doesn’t promote bacterial growth and is easy to clean and dries very quickly! This device is nice and small and easy to travel with. It has 7 adjustable intensities that you can use based on what feels the best for your skin. Before you cleanse your skin with a facial cleanser you can use a mode that warms up to massage the skin and open your pores to prepare your skin to react well with your cleanser. 104℉ Warmth is supposed to help to accelerate blood circulation to the skin, relieve facial edema and improve dark circles. In my experience it does reduce swelling around the eye area, especially in the mornings when I have allergies. It feels great on my skin and my skin has cleared up significantly and looks more evenly toned. The warming function also helps your products to absorb into the skin better, making your products last longer and be more effective!! The device has a rechargeable battery with a micro USB port on the bottom of it.