Tri Specs Bluetooth MP3 Sunglasses - Wireless Cell Phone Connection and Prescription Compatable, Black ZEISS Sola Sunlens Spherical polycarbonate lens with high-impact resistance UV400 Rx Compatible Power on by extending the in-ear speakers - One-touch activation of phone calls Clear Mp3 audio, dynamic volume system compensates for noise changes in the environment Voice prompts and voice dialing for easy, hands-free use. Call control buttons and microphone for cell phone communication on the temples of the glasses