This kind of snorkeling mask can freely with double tubes. It is water-proof and has a wide . It can help users to the underwater world clearly. Features: When inhaled, the air enters directly from both sides and does not stay in of vision. When exhaling, the exhaust gases is discharged from the exhaust valve in the middle to prevents the of fog. Equipped with high-definition lenses, users can enjoy the underwater scenery more clearly. Anti fog film design, can be up to 15000 hours of anti fog effect, no fog obstruct of sight. Waterproof system, floatings bead design, prevents seawater from entering the breathing tube. 3D fit, tight waterproof, fit face. Multifunctional camera design, detachable camera , convenient to use, record the underwater scenery. Widened elastic braided mirror belt, freely adjustable and comfortable. Double breathing tube design, make oxygen flows faster and more smoothly. Specifications: Material: silica gel Color:Black & Black Size: S Length of respiratory tube: 400mm / 15.7in Package Contents: 1 x Snorkeling Mask Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.