Polaroid polarized lens provide the best protection for eyes in efectively prevent ultraviolet rays bewildered light and harmful blue light Any time you wear is clear. - Freely telescoping boom speakers 270 rotatable freely adjustable and comfortable wearing. - Max volume 88dB with a better sound quality. - Built-in Li battery provides 3-5 hours continual talking and Bluetooth standby time of 5-7 days. - Suitable for various operating platform and portable with compact size. - Supports all bluetooth function devices handsfree answer calls. - Supports connect the music in the cellphone the computer or the MP3 via the Bluetooth adapter.