Open-back design: Our smart glasses feature an open-back design for superior sound quality, allowing you to hear your surroundings while listening to audio from your device, ensuring your safety. • TWS 5.3 Bluetooth Technology: Our devices are equipped with TWS 5.3 technology, which provides fast and reliable connectivity for high-definition audio. • Whether you're answering a call, using GPS, or listening to your favorite music, enjoy a distinctive audio experience. • Touch Control for Ease of Use: Our Bluetooth sunglasses feature touch control buttons, allowing you to easily manage your audio experience without needing to use your phone, tablet, or other devices. • Simply press and hold the touch button area for 3 seconds to turn it on and connect via TWS-F Bluetooth, and press and hold for 5 seconds to turn it off. • Please follow the instructions in the user manual to use the touch buttons for making and ending calls, playing and pausing music, etc. • Replaceable Lenses for Perfect Comfort: Our smart glasses feature brown and black lenses that efficiently filter light, protecting your eyes from strain, especially during outdoor activities. • These Bluetooth sunglasses are designed for comfort and stability, fitting all face shapes and staying in place even during strenuous exercise. (Free Delivery) and Returns Available