Import Polaroid polarized lens provide the best protection for eyes in efectively prevent ultraviolet rays bewildered light and harmful blue light - 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. - Operating frequency range: 2.4GHz. - Bluetooth: V3.0. - Wireless operating range: 10m. - Talk time: 3-5 hours. - Audio code: 15 bit - S/N: > 60dB - Standby time: 5~7 days - Operation temperature: - 10~ 55'C