Smart safety bluetooth glasses fit the face, Comfortable and safe to wear Function: Listen to music, make calls, protect eyes Packing list: Bluetooth safety glasses * 1 User Manual * 1 USB charging cable * 1 Glasses cleaning cloth * 1 High-impact Polycarbonate lens,Double sided hard coating,It can prevent wind and sand, be suitable for cycling,work safely,driveing,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 sunglasses, with built-in Bluetooth chips and speakers, provide you with rich and high-quality sound while minimizing the sound heard by others. This is an "open ear" headphones glasses designed to listen to music, talk on the phone, and safely hear sound from the environment. Built-in microphone for clear calls and access to the virtual assistant of the phone. Battery life:Rechargeable bluetooth sunglasses with up to 8 hours of continuous listening per charge. bluetooth safety glasses weight:45g, Bluetooth range:30ft Volume up operation reminder: After Bluetooth pairing, First please turn up the volume of your paired mobile phone, because some paired mobile phone volume settings are not synchronized, So need to turn up the volume of the paired mobile phone. Then turn up the volume of your bluetooth glasses, press the glasses volume button+ The Bluetooth connection method of the Bluetooth sunglasses and mobile phone is as follows: 1.After the glasses are turned off, 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 connection mode. 2.Click on the phone's Bluetooth to turn it on, find Vision 5B in the drop-down list and click to select Vision 5B