Unveil your natural beauty. SI Sonic brings you a premium facial treatment experience. SI-4000 gives you focusing care with 12 various level of Sonic Cleaning Technology to efficiently remove oil, blackheads and dirt residue on skin. 3D bristle design of SI-4000 fits the ergonomics of human face to effortlessly transmit sonic vibration to nose and cheek area. Featured Smart User Interface, you can experience professional facial cleaning experience at home with a 5-min pre-program or 3-min daily cleaning procedure. Especially built with medical grade Silicone, made available for sensitive skin users; Exceptional long battery life of around 40 days usage and 120 days standby (1 hour charging time) and compact design, made convenient for frequent travelers.