Like the floating speakers and MP3 player there is the floating bath tub disinfectant. It has Silver Ions which purifies the water when electricity is passed through them. An ideal gadget for eco-friendly Japanese as after the bath the device disinfects the water completely in a couple of minutes so it can be reused again. The onboard LED starts blinking as soon as the water is completely disinfected. The unit measures 86×86×110mm, weighs 250 grams and will be available in Japan from July 22 for 3800 Yen ($ 38).