The Anker Soundcore Liberty 4 are wireless in-ear TWS earbuds featuring a vacuum design and closed acoustic architecture. Equipped with dynamic drivers measuring 9.2 mm and 6 mm, they deliver sound across a frequency range of 20 to 40,000 Hz. With an impedance of 32 Ohms and a sensitivity of 106 dB, these earbuds connect via Bluetooth 5.3, supporting LDAC, AAC, and SBC codecs, as well as A2DP, AVRCP, HFP, and HSP profiles. The Anker Soundcore Liberty 4 supports spatial audio and is Hi-Res certified for enhanced sound perception. Active noise cancellation technology minimizes external sounds, while the transparency mode allows you to hear your surroundings. They can connect to multiple devices simultaneously and feature built-in microphones with noise cancellation for clear voice transmission. Control functions through touch panels. Each earbud weighs 4.6 g, and the charging case weighs 39 g, providing a total playtime of up to 28 hours, with the earbuds lasting up to 9 hours on a single charge. Fast charging allows for 2 hours of playback after just 10 minutes of charging. The charging case uses a USB Type-C port and is IPX4 rated for moisture resistance, with NFC support for convenience. The package includes a charging case and a USB Type-C cable.