Features 1.BLUETOOTH 5.0: Smart glasses connects to your mobile device and transmits its sound via Bluetooth while freeing up your ears and keeping you away from your phone screen. 10 meters effective distance. 2.LOW LATENCY SOUND: 60ms Bluetooth connection delivers fluent, lag free sound, immersing you in an immersive experience without interruptions due to sound delays or skipping. 3.BUILT IN MICROPHONE AND SPEAKER: With a covert omnidirectional microphone built into the frame of wireless Bluetooth sunglasses, you can answer calls hands free. 4.WIRELESS CONNECTIVITY: Smart Bluetooth glasses support Bluetooth protocol, which supports smartphones, tablets, laptops and other devices with Bluetooth sound capabilities, allowing you to be completely free from wired ties. 5.WIDE APPLICATION: Bluetooth sound sunglasses are designed with a tight fit, allowing for a full range of outdoor activities, suitable for leisurely walks, cycling, and playing rugby. specificationItem Type: Bluetooth Sunglasses Material: PC, Nylon TR90 Battery Capacity: Built in 140mAh Lithium Ion Battery (included) Connection Mode: Bluetooth 5.0 Standby Time: About 10 Hours Charging Time: 2 Hours Operating Time: 4?8 Hours, Depending On The Volume Level PackageList 1 x BluetoothGlasses 1 x EyeglassCase 1 x WipingCloth 1 x ChargingCable 1 x InstructionManual