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Spec: Item 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 How to Use: Connect and use, refer to the specific instructions packing list: 1 x Bluetooth Glasses 1 x Eyeglass Case 1 x Wiping Cloth 1 x Charging Cable 1 x Instruction Manual