Product Description Wireless Bluetooth Sunglasses, open ear design. You can easily listen to music, a podcast, audio books or talk on the phone safely while jogging, walking, skating, biking, or just while you sit at the beach. Lenses are polarized and provide eye protection from UV rays. Buttons on sunglasses allow you to change the volume, skip tracks, play, pause and anser or reject a phone call instead of using your phone. Product Specs: Bluetooth Specification: 5.0 Frequency Range: 2.402-2.480GHz Transmission Distance: 10m Battery Life: 4-5hrs Battery Capacity: 3.7v/180mah Charge Voltage: DC5V/500mA Charge Time: 2-3hrs Earphone Power: 5w Receiving Sensitvity: -40dbm Audio Range: 20hz-20Khz