Used about 10 times. Open Call Noise Reduction: With an open-call design and noise reduction technology, clear and high-quality sound is ensured even in noisy environments. 270° Rotatable Boom: The microphone boom can rotate 270°, allowing you to adjust it to the most comfortable and effective position for calls. Long Battery Life: Equipped with a 150mAh battery, this earphone provides long-lasting performance on a single charge, offering reliable audio support throughout the day. BT Connection: The DG09 earphone adopts BT technology, allowing for easy and stable connection with your device, so you can move freely without being tied down by cords. Specifications: Speaker Type: 16.2mm Large Dynamic Composite Diaphragm Speaker Battery: 150mAh Polymer Battery Microphone: 1 Single-Directional Microphone, 1 Omnidirectional Noise-Canceling Microphone Usage Time: 10 hours (at standard volume) Standby Time: 200 hours Effective Range: Over 10 meters BT: 5.3 Color: Black Package Size: 15*12*5cm Package Weight: 170g Package List: 1 x Earphone 1 x Charging Cable 1 x User Manual