Featuring a 10 mm-diameter dynamic driver unit, two microphones for environmental noise cancellation during calls, feedforward active noise cancellation (ANC), and Awareness mode, the HUAWEI FreeBuds 4i earbuds achieve crystal clear audio delivery. With a low power solution and 55 mAh battery, the HUAWEI FreeBuds 4i earbuds have a long battery life and a fast charging speed via the charging case. Long Battery Life and Fast Charging: 10 Hours of Playback on a Single Charge 10 minutes charging = 4 hours of playback. Active Noise Cancellation: Comfortable noise cancellation in most day-to-day environments. Awareness mode in one pinch-and-hold. Crystal Clear Sound: Crystal clear sound delivered in all frequencies from a 10mm dynamic driver unit. Headphone FeaturesPlastic ear pieces. USB Cable for Charging Case cord. Detachable cable. Connection: wireless. Bluetooth enabled for a wireless connection to your devices . Connects to devices via Bluetooth. 10mm driver. On ear controls. Active noise cancellation. 10m range. IPX5 water resistant. Compatible with universal smartphones. Batteries required 1 x rechargeable battery (not included). Rechargeable battery. 10 hour battery life. 60 minute charging time. Fast charge to boost battery life. Charging case included. In the box: Yes. General InformationModel number: Otter-CT030. Manufacturer’s 2 year guarantee. EAN: 6941487210893. Warning - Not suitable for children under the age of 3 years due to small parts and entanglement hazard.