Pre-treat for cleaner result with ultrasound technology! Our Ultrasonic Stain Remover Pen targets tough stains, from ink to coffee, by pre-treating clothes before they\'re even in the wash. Apply it to the problem area. Let the water and detergent with ultrasound technology get to work. Then wash for impressive results across a range of fabrics. Removes different types of stains such as lipstick, chocolate, jam, wine and more Ultrasound technology: up to 48, 000 vibrations per second Gentle on fabrics, including silk and wool