Black technology Bluetooth headset glasses, the fifth generation black technology product researched for 20 years, can make phone calls, answer calls, listen to music, charge for two hours, and standby for 72 hours. It is a new high-tech product, 1000 sets are set up and shipped in the factory. We can customize the color of tuhao gold and enterprise logo according to the customer requirements. Welcome to discuss and consult with customers around the world. Thank you!