Bone Conduction Glasses with Open-Ear Headphones, Smart Glasses Dual Bluetooth Pairing, Blue Light Glasses Photochromic Lenses, IP6 Waterproof, Hand-Free Calls and Music, Gifts for Dad, Upgraded,

Photochromic Lenses with UV420+ transition for automatic tint adjustment outdoors. Blue light glasses block bluerays for indoor and outdoor use. Note: Bone conduction headphones may have sound leakage if device volume is over 70% Upgrade to Bone Conduction Headphones: Unique design keeps you aware of surroundings, delivering sound through skull bones to protect hearing. CAUTION: Not recommended for customers with bone conduction dB HL above 40dB HL for optimal listening 4.2 Version Bluetooth and Dual Pairing: the wireless headphone Bluetooth provides access to iOS/Android devices, like cell phones, desktop PC, or laptop, and enables dual Bluetooth devices pairing simultaneously. 4.2 Bluetooth ensures fast&stable connection and up to 10 meters barrier-free wireless range Exceptional Battery Life & IP6 Waterproof: A 250mAh battery fully charges in 2 hours for 10 days standby, 4 hours playback, and 3 hours talk time. Usage varies with volume. IP6 waterproofing withstands rain or sweat for outdoor use. Low maintenance. Enjoy extended battery life and durability Hands-Free Calling and Music: These wireless smart glasses offer convenience while driving or jogging. Easily control volume, calls, and music with frame buttons. For optimal experience, maintain Bluetooth device volume at 50%-60%; higher volume may cause sound leakage or echo during calls