Excelvan Wireless Bluetooth Polarized Smart Sunglasses Hands-Free Talk Voice Control Headset What You GetWireless bluetooth v2.1 EDR polarized smart sunglasses headset talk voice control with 1 year warranty and friendly customer service. Wireless ConnectionEnjoy 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. Voice ControlAfter Bluetooth connected, press button M twice continuously to start voice control function(iPhone Siri function/ Android phonetic function). In power on situation, K3 will be off automatically if failed to connect any device after searching for more than 2 minutes. Lens ReplaceableCan replace the lens with prescription type. If has nearsight or farsight, the lens can be replaced in accordingly with your requirement. Fashionable DesignNewest Design with fashionable frame . Unique design makes it more fashionable for driving, ridding or climbing.