TOZO NC9 is created with versatility in mind and designed for everyday use, providing professional hybrid 3-layer active noise cancellation technology with Transparency Mode. It also features a dual-mic ENC system, 40-hour battery life, wireless charging, Bluetooth 5.3 technology, and IPX6 water resistance, which offers a premium listening experience. Support HSP, HFP, A2DP, AVRCP. Provides in-call stereo sound. Greatly improve the transmission speed and providing you with a low-latency listening experience. Pick up the two headsets from the charging case, and they will be paired automatically. Then simply enable bluetooth connection on your mobile phone to pair the device with your earbuds.