The Anker SoundCore Liberty 4 NC are in-ear TWS headphones featuring a closed acoustic design and 11mm dynamic drivers. They support wireless connectivity via Bluetooth 5.3 and are compatible with A2DP, AVRCP, HFP, and HSP profiles, as well as the LDAC codec. The headphones can connect to multiple devices simultaneously. With an IPX4 water-resistant rating, they are protected against moisture. The Anker SoundCore Liberty 4 NC headphones are equipped with active noise cancellation, a transparency mode, and are Hi-Res certified for high-quality audio playback. Touch controls allow you to manage playback, calls, and other functions easily. Built-in noise-cancelling microphones ensure clear communication. You can also summon your voice assistant with ease. The battery provides up to 10 hours of playtime on a single charge and up to 50 hours with the charging case. The wireless charging case adds convenience to the device's use. Fast charging allows for up to 4 hours of playback with just 10 minutes of charging. Charging is done via a USB Type-C port. The Anker SoundCore Liberty 4 NC is made from plastic with silicone ear tips. The package includes a charging case, a USB Type-C cable, and additional ear tips for a customized fit.