Excelvan Wireless Bluetooth V2.1+EDR Polarized Smart Music Sunglasses Headset Headphone Hands-Free Talk Voice Control for Outdoor Use Enjoy music with Bluetooth V2.1+EDR. Wireless connection to your BT device. It's widely compatible with most BT device above BT V2.1+EDR like iPhone, Samsung, THL, Sony, Moto, etc. Can replace the lens of product with prescription lens. customers may be nearsight or farsight, they can replace the lens according to their requirements. Newest Design with fashionable frame . Unique design makes it look more fashionable for driving, ridding or climbing. Voice Control. After Bluetooth connected, press button M twice continously to start voice control function.(iPhone's Siri function/ Android phone's phonetic function. Automatically Power off. In power on situation, K3 will be off automatically if failed to connect any device after searching for more than 2 minutes.