Excelvan Polarized Sunglasses Eyewear Bluetooth V3.0 Handsfree Handphone for iphone Samsung HTC Etc (Black) Bluetooth: This Bluetooth Sunglasses is available for devices with blueooth function, such as, computer/ smartphone/ tablet. You can call through this bluetooth sunglasses when you are driving. You also can listen to music in any devices with bluetooth function. Comfortable Earphone: Scalable Earphone/ 270 rotatable/ freely adjustable and comfortable wearing Sunglasses: Polarized Sunglasses can protect your eyes as it can effectively prevent ultraviolet and harmful blue light. So it is the best partner for driver and the fan of outdoor activities, such as cycling/ fishing/ travelling/ climbing. Anytime you wear it, it wil give you very clear visual feast! Bluetooth: V3.0;Earphone: Stereo Talking Time: 15-20 hours;Standby Time: 100 days