H7 Foldable Wireless Bluetooth Headset With Microphone Support TF Card, AUX 1. H7 wireless headphones with BT V5.0 technology, providing high-speed and stable transmission. 2. Built-in powerful steel magnetic speaker, shocking heavy bass, panoramic surround sound, pleasing to the ear 3. It has multiple playback modes, such as BT connection, TF card and 3.5mm audio cable, so you can enjoy endless music. 4. Foldable and adjustable headband length, imitation protein leather ear cups, comfortable to wear for a long time. 5. Built-in microphone for hands-free calls, providing clear and realistic call sound 6. 400 mAh high-capacity battery provides up to 16 hours of music playback time (medium volume) Parameters. 1. BT version: V5.0 2. Operating range: 10 meters (no obstacles) 3. Speaker unit: 40mm 4. Frequency response: 20Hz-20kHz 5. Impedance: 32 6. Sensitivity: 103+-3dB 7. Battery capacity: 400 mA 8. Music time: about 14-16 hours 9. Charging time: about 2-3 hours 10. Charging port: Type-C