Bluetooth Sunglasses Up to 6 hours of talk time on a single charge (Built-in Lithium Ion Polymer Rechargeable Battery). Voice dial, Re-dial, mute, volume adjustment button Absolute freedom with no wires or cords to dangle or tangle. 100% hand free while talking on the pho Polarized lens material to filter out 100% of all UVA, UVB, UVC and harmful blue light. Flip-up lenses with contours that maximize protection against sun, wind and side impact.