Design & Material: Built with TR + ABS frames and UV400 protection.Lenses: Photochromic, polarized, and anti-blue light lenses.Audio & Connectivity: Bluetooth V5.4 with a 10-meter range, built-in microphone, and 10mm speakers.Battery & Playtime: Dual 55mAh batteries providing up to 5 hours of music playback or call time, charged via magnetic charging in about 1.5 hours.