Overview: This BT smart sunglasses is a great companion for your daily life. It is a perfect combination of BT and Polarized Sunglasses. You will have a clear vision no matter what kind of situation. What's more, it can make you enjoy the freedom of wireless music and hands-free call. It is suitable for outdoor activities, such as cycling, fishing, traveling, climbing, golfing, etc. Features: [Perfect Combination] The BT headset sunglasses perfectly combines Polarized Glasses with BT 4.1 Headset. Compatible with almost all BT-enabled audio devices. [Polarized Glasses] It can eliminate glare to alleviate eye fatigue, give you a clear vision, and provide good impact resistance to protect your eyes. [Button Control] 3 buttons can easily control music and call - answering/ending calls, playing/pausing, previous/next songs, and volume +/-. [High-quality Material] The fashionable glasses frame is made of high-grade material, light, flexible, and durable. The lens can be rotated, disassembled, and changed. [Hands-free with Mic] Built-in microphone supports hands-free calls. Suitable for outdoor activities, such as cycling, fishing, driving, climbing, playing golf, etc. Specifications: BT Version: 4.1 Operating Distance: 10m (no obstacle) Frequency Response: 20-20KHz Impedance: 16 Extended Length of Earphone: 14mm Rotary Degree of Earphone: 270 Battery Capacity: 150mAh Lithium polymer rechargeable battery Music Playing Time: about 6 hours (depends on music volume) Charge Voltage: 5V Charging Time: about 2 hours Charging Port: Micro USB port Color: Black Item Size (unfolded): Approx. 17.5*16.5*3.8cm/6.89*6.49*1.49in Item Weight: Approx. 44g/1.55oz Package Size: Approx. 18.5*8.5*7.0cm/7.28*3.34*2.75in Package Weight: Approx. 122g/4.30oz Package List: 1 * Smart Glasses 1 * USB Cable 1 * Cleaning Cloth 1 * Storage Bag 1 * User Manual (English/Chinese)