Echo’s surface is covered by simulate tender human skin which is made by rubber paint, and it has five different vibration mode. You only need operate it by single hand, and no matter open / close the product by a long press, or click it to switch the vibration strength, or change vibration mode with double-click, they are very convenient to you. The slim waist and the shape curve of the Class A surface design are all like a perfect female ketone body, and more like a sexy soft tongue. Its smooth surface can better closes to your skin, and better transmit the joy of vibration to every nerve of your body to make you relax.