High-impact Polycarbonate lens, Double sided hard coating, It can prevent wind and sand, be suitable for cycling, work safely, driving, protect your eyes. connect to your phone Bluetooth, Listening to music and making phone calls. Bluetooth safety glasses can be connected to two devices simultaneously Smart safety glasses, with built-in Bluetooth chips and speakers, provide you with rich and high-quality sound while minimizing the sound heard by others. Built-in microphone for clear calls and access to the voice assistant of the phone. Battery life: Rechargeable bluetooth glasses with up to 8 hours of continuous listening per charge. Weight:45g, Bluetooth range:30ft Volume turn up operation reminder: After Bluetooth pairing, First please turn up the volume of your paired mobile phone, Then turn up the volume of your bluetooth glasses, press the glasses volume button+ Bluetooth pairing method for Bluetooth safety glasses and mobile phones: 1. Press and hold the power button for 5 seconds (for 5 seconds, do not let go) until the red and green light flash alternately and the glasses enter Bluetooth pairing mode. 2.Turn on Bluetooth on your mobile phone, find "Vision 5A/5B" in the drop-down list and click to select "Vision 5A/5B", Pop up window, click confirm pairing. Smart safety bluetooth glasses fit the face, Comfortable and safe to wear Function: Listen to music, make calls, protect eyes