1. Super quality durable glass, PC resist corrosion.2. 40m/130ft waterproof depth, suitable for underwater photography.3. Adopt seamless and fully enclosed process, protect against water, drops, scratches, and dirt.4. One-way valve vacuum design, better airtightness, no leakage.5. Clear image view and easily control underwater.6. Use for dedicated cell phone, rotating and labor-saving opening design, conductive adhesive touch control, high strength and pressure resistance.7. Ideal for diving, surfing, snorkeling, skiing, yacht or other activities.