F9-8 TWS Bluetooth 5.1 Headphones Charge Display Premium Wireless Headset. Features: - 9D surround sound, 5.1 dual-ear chip, large capacity, true wireless Bluetooth headset. - Graphene bass diaphragm, HIFI high-frequency technology, 10MM dynamic speaker unit. - Two connection methods: single / double free to use, single ear listening to enjoy alone, listening to HiFi stereo in both ears. - Binaural HD call, 5.1 automatic boot pairing, CVC8.0 built-in active noise reduction IC. - It features binaural HD call, play pause, answer hang up, summon Siri, volume adjustment, up and down song switching, automatic boot, automatic pairing, intelligent noise reduction, no delay in the game. Specification: 1. Color: Black 2. Bluetooth version: V5.1 3. Support: HFP 1.7, HSP 1.2, A2DP 1, AVRCP1.6, SPP 1.2 and PBAP 1.0 4. Charging Voltage: DC 5V 5. Microphone sensitivity: -42Db 6. Working temperature: -10 to 50 C 7. Frequency response range: 20-20000Hz 8. Sensitivity: 120dB+/-5dB 9. Transmission Distance: 10m 10. Charging Time: about 1 hours 11. Accumulated battery life: about 220 hours 12. Headphone battery capacity: 50mAh 13. Charging box battery capacity: 1200mAh 14. Weight: 103g 15. Package: retail package Package Includes: 2 pcs x earphone 4 pcs x ear cap 1 pcs x charging box 1 pcs x charging cable 1 pcs x user manual Friendly Note: We do our best to make sure images are same with the physical products. The variations in display settings and lighting conditions may cause slight differences in the actual product's color compared to the images. The proportions depicted in the pictures may not be to scale, so it is advisable to refer to the provided measurements or descriptions for accurate dimensions. We measure the products manually with ruler. A reasonable error with 1-3cm.