ANKER SoundCore Liberty 5 Active Noise Reduction Bluetooth Wireless Earphones 1. Bluetooth version: 5.4 2. Transmission distance: about 10-20m 3. Use time: about 12-48h (support wireless fast charging) 4. Interface: Type-C 5. Packing list: earphones x 1, charging cable x 1, ear caps x 6 pairs 6. Charging compartment size: about 5.9 x 29cm 7. Weight: the whole machine about 52.5g, single earphone about 4.6g Features: 1. Dynamic vocal noise reduction system, with ANC 3.0 adaptive noise reduction algorithm, efficiently eliminates vocal interference and environmental noise, bringing a full-scene immersive noise reduction experience 2. 6-mic AI call noise reduction, adaptive call environment noise reduction 3. 6 pairs of silicone ear caps to fit various ear shapes, more comfortable and stable to wear 4. 9.2mm dual-low-frequency conduit bio-diaphragm speakers, dual-low-frequency conduit architecture, enhanced low-frequency output, lightweight and highly flexible bio-diaphragm 5. Support Dolby Atmos technology to create a wraparound stereo sound field. 6. HearID 4.0 sound pattern technology, combined with the preference test, for each pair of ears to measure the exclusive listening EQ, intelligent matching of the ideal listening effects 7. 4.6g lightweight body, wear more lightweight, 30-degree inclined ear handle into the ear design, natural fit ear canal, high flexibility silicone ear caps, automatic adjustment of the form 8. Sliding lid charging case, one hand can be pushed open smoothly, more convenient to pick up and put down the headphones. 9. Bluetooth 5.4, low latency, no lag, more stable connection, dual-device connection, free to switch without stopping the connection 10. IP55 dustproof and waterproof structure design, effectively resist daily rain, sweat and dust intrusion. 11. Hearing protection, accurately test the hearing condition, intelligent volume adjustment. 12. Positioning anti-loss, with the help of APP to let the device emit a tone to determine the location of t