The Ulanzi A21 USB-C Black is a compact wireless microphone set designed for recording audio on smartphones with a USB-C port. The set includes two transmitters and a USB-C receiver . It's a convenient solution for creating content for social media, recording conversations, interviews, vlogs, and educational materials when you want to quickly improve audio quality without the hassle of additional cables.

The system operates wirelessly in the 2.4 GHz band and provides a range of up to 100 m in open space. The microphones record audio in 32 kHz/24-bit quality, and the 20 Hz-20 kHz frequency response preserves the natural sound of the voice. A significant advantage is the ability to adjust the sound to the situation, supported by AI. Users can choose from Original, Noise Reduction, and Reverb modes. The microphones can also be quickly muted using the Mute function.

The transmitters have built-in 75 mAh batteries and operate for up to 6 hours on a single charge. The receiver draws power directly from the smartphone it's connected to. The case itself functions as a power bank and has a capacity of 400 mAh, allowing you to be prepared for even a long shoot. The case has a long, retractable drawer design and is charged via USB-C .