Use pulsa bath wet or dry. Its soft, porous, spongy texture absorbs soap or lotion allowing it to glide softly on the skin. Pulsabath vibrating Bath Sponge is completely waterproof so use it freely in the bath, shower or hot tub. Its vibrating massage action will invigorate and relax tired muscles. For a thrilling encounter, use it with your sweetheart. Uses 2 AA batteries, not included.