Features: Bone Conduction Technology: The DG09 earphones use advanced bone conduction technology to deliver sound directly to your inner ear, bypassing the eardrum. This allows you to stay aware of your surroundings while enjoying your music or calls. Open-Call Noise Reduction: The open-call design and noise reduction technology ensure clear, high-quality sound, even in noisy environments. 270 degrees Rotatable Boom: The microphone boom can be rotated 270 degrees , allowing you to adjust it to the most comfortable and effective position for calls. Long Battery Life: With a 150mAh battery, these earphones provide long-lasting performance on a single charge, ensuring you have reliable audio support throughout the day. BT Connectivity: The DG09 earphones feature BT technology for easy and stable connection with your devices, offering you the freedom to move around without being tied down by wires. Specifications: Speaker type: 16.2mm large dynamic composite membrane speaker Battery : 150mAh polymer battery Microphone : One single-directional microphone, one omni-directional noise-canceling microphone Usage time: 10 hours (standard volume) Standby time: 200 hours Effective range: 10 meters or more BT: 5.3 Color: Black, Beige (Optional) Package Size: 15*12*5cm Package Weight: 170g Package List: 1 * Earbud 1 * Charging Cable 1 * User Manual