WATERLESS - Convenient operation! No need to add the water, simply remove cover and drop one or two drops of the oil or fragrance to the pad. Secure cover, turn on and it begins to diffuse. OPERATED BY RE-CHARGABLE BATTERY OR USB - Runs using an included USB cable or option for re-chargeable battery. Level 1 speed run time approximately 5.5 hours, Level 2 run time approximately 2.5 hours and Level 3 run time approximately 1.5 hours. QUIET – Operation at the standard Level 1 diffuser runs quietly. DIFFUSER – Diffuses essential oils very effectively. Only a few drops required depending on scent, turn on and begin enjoying the smell immediately! QUALITY - Made of high-quality material including medical grade material pp. BPA-free and essential oil friendly materials.ABSORBING PADS – Included with diffuser are eight (8) replaceable micro-absorbing pads.the pads super Small sizes PORTABLE DIFFUSER. super Small size, you can carry it in your pocket. Perfect for use in your car, home, bedroom , on your office desk.in air plane. or when you are in traveling.sizes of it are 2 1/6 inches * 2 1/6 inches * 1 inches. Each Pack includes 1 diffuser, 1 USB cable, 8pcs pads, 1 Hand Strap,1 silicone pad,