Polaroid polarized lensPC lens, can effectively block uv rays and harmful blue light, 2: Support memory: 128M - 32 gb of 3: Support MP3 WAVWMA format4: USB3.0, transmission speed faster5: Hydraulic telescopic headphones, can rotate 270, can be adjusted freely, wearing comfortable, headphones, power of 5 mw, 6: High quality audio effect and MP37:Polymer lithium battery 150 mAh, MP3 for 5 hours, bluetooth talk about 3 hours, bluetooth standby for 30 days8: bluetooth protocol V4.1, 9: Charging time:2-3h10: Bluetooth distance :10 meters