BT-63 Wireless Bluetooth Neck-mounted Magnetic Headphone 1. Bluetooth version: 5.0+RDE 2. Sensitivity: 91dB 3. Signal to noise ratio: 95dB 4. Battery capacity: 200mAh 5. Charging input: 5V 1A 6. Playing time: about 20 hours 7. Support TF card: 128M-32GB(not included) 8. Weight: about 50 grams Features: 1. Liquid silicone is used for the halter body, with anodized metal shell, highlighting the quality and design sense 2. Bluetooth connection, memory card can also be inserted, you can listen to songs without your hands 3. The graphene diaphragm earphone can make the sound heard more smoothly and clearly 4. Low-power Bluetooth 5.0 chip, simple and fast connection, stable signal 5. Intelligent noise reduction, restore high-definition vocal calls 6. Multi-party smart compatibility, support most Bluetooth devices 7. The earphone is magnetically absorbed, convenient design, close to automatic adsorption, hanging in front of the neck when not in use, no need to wrap in the bag, and wont shake everywhere 8. Lightweight material design, reduce the weight of the headset, with ergonomics, deep fit the auricle, comfortable and painless for long-term wearing 9. Smooth skin-friendly silicone material, memory arc, automatic rebound to restore the original shape, adjust the arc at any time, more comfortable and natural to wear 10. Memory link function, connect immediately after booting 11. Humanized wire control design, simple and convenient operation