Automatically Adjusts Indoors and Outdoors! Convenient Photochromic Sunglasses These sunglasses are a high-performance model featuring a "photochromic function" that automatically changes the lens color depending on the intensity of UV light. They are transparent indoors and transform into sunglasses outdoors by sensing UV rays. You don't need to switch between different pairs for each scene, making them comfortable to use. ■ Features Photochromic Lenses The lens color automatically changes according to the amount of UV light. They reduce glare and lessen eye strain. Polarized Lenses Cuts reflected light from surfaces like water and glass. Maintains a clear view while driving or enjoying outdoor activities. UV400 Protection Blocks approximately 99% of harmful UV rays, protecting your eye health. ■ Recommended Uses Ideal for a wide range of outdoor activities such as driving, golf, fishing, mountain climbing, sports viewing, cycling, and camping! ■ Color Sunglasses: Black ■ Shipping Shipping Method: Yu-Packet Post Delivered to your home mailbox. Delivery takes approximately 2-5 days from shipment. Trackable with Tracking Number You can check the tracking number on the transaction screen after shipment.