Item No.: MP2600C Product Name: 4 In 1 Mp3 Sunglass+Bluetooth Description: MP3 Player: 4 in 1,Bluetooth+USB2.0 Disk+MP3+Sunglasses Unique design: wirelessly combines digital music MP3 player and polarized lens Polarized lens: blocks 100% of all UVA, UVB, UVC and harmful blue light Supports MP3, WMA and WAV format Memory capacity: 128 / 256MB / 512MB / 1GB Earphone adjustment: can adjust the earphone extenders to fit users?ears Built-in lithium-ion polymer battery: 3.7V, 150mAh, up to 4.5 hours continuous playtime