Lcrystal Frame Mount Housing + Screw + Mount for YI 4K Action Camera US Edition Night Black and White Compatible with YI 4K Action Camera only, not compatible with xiaomi yi first edition. Made of high quality pc, very durable. Size: 6.8*4.6*2.3cm. Prevent the camera or DV of the scrape. NOT waterproof and not optimized for use in extreme conditions.