12x50 Monocular-Telescope for Smartphone BAK4 Prism for Clearer and Brighter Images 18mm BAK-4 prism and 50mm fully multi-coated green film objective lens can collect more lights, and deliver brighter view. Full 90° angle adjustable, plus 360° rotation capabilities allows you to get the right angle and position for perfect with push button locking mechanism. Our phone adapter is compatible with our tripod, which means you can attach phone adapter with your phone onto a tripod. Our monocular comes with a compact tripod,which can offer you better observe experience. The tripod also can be regarded as a handle and easy to hold by one hand as shown in the picture. Upgraded Large Eyepiece Upgraded 20mm Multi-layer Eyepiece with BAK4 Prism provides you with brightness and clarity. Large eyepiece offer you wider field of view. IPX7 Waterproof Monocular 100% waterproof/fog proof/dust proof:O-ring sealed and nitrogen purged for reliable, fog-free performance. In water for 30 minutes under one meter depth.