MP3/BLUETOOTH SUNGLASSES Automatic switch when there is incoming calls or making calls while playing music. Voice dial, Re-dial, mute, volume adjustment button Absolute music freedom with no wires or cords to dangle or tangle. 100% hand free while talking on t Store more than 2400 songs on the 8GB flash memory. Polarized lens material to filter out 100% of all UVA, UVB, UVC and harmful blue light.