Bluetooth-compatible glasses speaker: dynamic drive, sound cavity design, avoid hearing impairment In-ear design helps you keep an eye on your surroundings, avoid danger and enjoy music Open solution: allows you not only to listening to music, answer calls, but also to hear notifications from glasses, while listening to the world around you The sunglasses have built-in noise-canceling microphones that allow you to make and receive calls Transmission distance: 33 feet (10 meters) Use Noise Canceling Microphone: This wireless Bluetooth-compatible 5.0 has wide compatibility. So these glasses are for cycling, running, driving, boxing, fishing, playing basketball, shopping and other outdoor activities, you can easily make calls with high-quality sound. High performance: charging time is 2 hours, standby time is 6 hours, playing music for about 3-4 hours (depending on the volume and ), continuous talking for about 4-6 hours. IPX7 Waterproof Sunglasses: Our wireless Bluetooth-compatible 5.0 sunglasses are designed with good waterproof effect, which can easily resist sweat and rain. The glasses are for sports, music and calls. Product Name: Smart Bluetooth Glasses Speaker type: dynamic speaker; Microphone: -40dB±3dB; Compatible profiles: A2DP, AVRCP, , HFP; Transmission distance: 33 feet (10 meters); Battery: Rechargeable Li-ion 75mAh; Continuous playback: 3-6 hours (normal volume); Standby time: 10 days; Charging time: 2 hours; Waterproof grade: IP7; Bluetooth-compatible version: CSR5.0; Working temperature: -10°C-+50°C Humidity 0-90%; Colour:Black type:C:E31-C(Sunglasses) Material:PC+CTA+TR90+nylon Package Contents: 1 x Bluetooth-compatible glasses 1 x USB cable 1 x glasses cloth 1 x Bag 1 x Instructions in Chinese and English Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.