KRISTALL LIQUID SCREEN PROTECTOR coats every aspect of the device at a nanoscopic level and protects more thoroughly than alternative materials. The result is a truly durable and invisible liquid glass coating that substantially delivering truly outstanding benefits. BENEFITS & FEATURES: Easy to apply and suitable for DIY application Protection against abrasion and scratches Super hard 9H wearing and durable An invisible but glossy finish Reduces finger marks and smudges Improves clarity and brilliance Resistant to both acid and alkaline Dirt repellent surface Preserves touch screen sensitivity 1 Year durability

Below is the video on how this item work. Same item but different Brand