ANC Hybrid 3 layer Active Noise Cancellation & Transparent Mode. 6 Microphone and ENC Environmental Noise Cancellation, More Clear Calls: Each earbud has 3 microphones. A dedicated internal and two external microphones pick up your voice and isolate it from outside noise. One-step Pairing & Touch Control, Support TypeC Charging/Wireless Charging. IPX6 Waterproof: Go ahead and wear them in the rain, while working out at the gym, running, jogging, hiking, yoga, or traveling. Long Last Battery Life: TOZO NC9 wireless earbuds can last for over 13 hours' playtime from a single charge and 27 extra hours in the compact charging case. In the Active Noise Cancellation mode can last for over 7 hours' play time.