Self auto back-washer is a new patent appliance for modern family bathroom. 1) Functions: Each self auto back-washer assembles two basic working discs, washing disc and massage disc. Washing disc It is a round has diameter of 12cm, and the washing-cloth cover can be easily exchanged. When it works, it rubs body in a rotational motion and runs up and down according to selected journey, and washing disc rubs away the dirt on back, chest, belly and arms, washes away the dead hardening skin debris, reduces skin disease risk. More than that, deep massaging back muscle and nexus will activate under-skin tissues, enhance blood circulation and reduce excessive under-skin fat. Magnetism massaging disc: The massage disk is a round has diameter of 13cm, and three magnetic silicon rubber balls (with individual magnetic strength of 2000GS) rotate on the smooth plastic cover surface, massaging your back muscle group inside this rotating magnetic field. It stimulates many nexus, activate deep under-skin tissue, clean out blood vessels and neuro-network, relieve muscle pains and greatly enhance your health. 2) Operation: Using computer digital program to control operation. The working disk offer two-speed modes, 16 adjustable journeys with auto memory. During the journey range, fixed-point massage together with short journey back-washing massage could be applied at any position. The machine is also equipped with water-proof remote control so that the bather can control the washing disk or the massaging disk according to his feeling about his own back in an instant way using the remote control without the trouble to turn back. 3) Safety design: a) The back-washer use DC current motor with a safety working voltage of 24V. And the power supply is provided by an external AC220V/110V-DC24V transformer, and this transformer has electric over-load protection b) A magnetic induction system is designed on the corresponding position. Once finger or anything insert into the working groove, the working disc will move to opposite direction and give a caution by ring, and if repeat the action of insert many times, the power supply will be cut off automatically c) Back-washer has water-proof design and it suitable for used in family bathroom d) Data i) The product size: 95mm x 230mm x 957mm ii) The package size: 245mm x 280mm x 1,010mm iii) The gross weight: 9.2kg