Product Name: Neck Bluetooth Headset (in-ear) Bluetooth: 5.4 Transmission range: <=10 meters Battery: Rechargeable polymer lithium battery Charging time: < 2.5h Battery life: 30H Large capacity battery: 500 mah Charging interface: Type-C Dual mode: Bluetooth/Card Function: Multi-point connection + voice prompt Bluetooth name: FD-1 Usage and function introduction: Power on: Hold down the power button for 3 seconds Power off: Hold down the power button for 5 seconds Bluetooth Mode TF mode: Click the Power button Ear back mode: four quick power button Voice change (male and female voice change) : six quick power button New sound card headphones: Wireless sound card live headphones can be used for singing, suitable for outdoor and indoor use. Skin friendly feeling, let you feel the warmth of material and music. Memory silicone material, can be bent arbitrarily, tens of thousands of bending tests are still intact, comfortable and skin-friendly, dirty, not easy to wear. ACS panoramic surround sound, restore shock sound quality, professional acoustic tuning, high elastic composite diaphragm, with excellent density and elasticity, high fidelity sound quality, large moving circle shock sound, let you enjoy live music. Wireless ultra-clear call, microphone noise reduction technology, so that video calls as clear as face-to-face conversation, sports can also be normal call. LED display: The wireless sound card live headset has an LED display that displays the battery level at a glance to help you manage power efficiently. Charge the headset as needed to avoid interference and ensure uninterrupted use. Neck strap design: Designed for sports use, making the headset safe and preventing loss during exercise. The wireless design provides comfort and style without the hassle of cables. Natural magnetic absorption, non-slip off, take off the earphone when walking without shaking, earphone close firmly adsorbed. Fast connection: Easily connect your smartphone or tablet via Bluetooth for seamless use. The three-button interface allows easy functional switching and syncing of audio and video Waterproof headphones: Multi-layer protection, waterproof and sweat resistant. Ideal for strenuous exercise and unpredictable weather conditions.