Specification: Item Type: Bluetooth Glasses Material: TP90, PC, TAC Bluetooth Protocol: 50 Charging Time: 90min Built in Polymer Lithium Battery: 100mAh Sound Channel: Dual Speakers, Stereo Sound Package List:1 x Bluetooth Glasses1 x Charging Cable1 x Manual1 x Storage Bag Directional Sound: Wireless bluetooth glasses use directional sound to keep the safety and accurately transmit the sound to your ears. HiFi Sound Quality: Bluetooth glasses chip to headset and speaker optimization upgrade, to ensure effective reduction of call noise, restore fidelity. Stable Performance: Smart bluetooth glasses use high version of Bluetooth solution, stable performance, strong compatibility, more powerful, to bring you high definition call sound quality. Long Standby Time: Smart bluetooth glasses comes with a large capacity battery 100mAh, charging 90 minutes, 80 percent volume continuous listening music for 6 hours. Waterproof Design: Smart glasses with accuracy craftsmanship, with water resistance, up to P5 level, effectively prevent the splash of water, sweat, and brief immersion. Directional Sound: Wireless bluetooth glasses use directional sound to keep the safety and accurately transmit the sound to your ears. HiFi Sound Quality: Bluetooth glasses chip to headset and speaker optimization upgrade, to ensure effective reduction of call noise, restore fidelity. Stable Performance: Smart bluetooth glasses use high version of Bluetooth solution, stable performance, strong compatibility, more powerful, to bring you high definition call sound quality. Long Standby Time: Smart bluetooth glasses comes with a large capacity battery 100mAh, charging 90 minutes, 80 percent volume continuous listening music for 6 hours. Waterproof Design: Smart glasses with accuracy craftsmanship, with water resistance, up to P5 level, effectively prevent the splash of water, sweat, and brief immersion.