The Ulanzi A21 is a wireless lavalier microphone system designed for creators who need clear audio without the hassle of cables. It uses a 2.4GHz wireless connection to link two compact transmitters to a Type-C receiver, allowing you to capture sound from a distance of up to 100 meters in open spaces. The 360° omnidirectional polar pattern ensures that voices are picked up consistently from all directions, while a 32kHz/24bit sampling rate and a signal-to-noise ratio above 58dB keep the recordings crisp. To help you manage challenging environments, the system includes AI noise cancellation and a one-tap 3D-like reverb effect for added depth. Each transmitter is remarkably light at just 8g and measures 28 × 26 × 13 mm, making them unobtrusive when clipped to clothing. You can attach them using the included clips or magnets for a more discreet look, and the furry windshields help reduce wind interference during outdoor shoots. The transmitters provide up to 6 hours of continuous use on their own, but the accompanying 49g charging case extends the total system runtime to around 36 hours by recharging the microphones twice. The entire set, including the receiver and charging cable, is ready for mobile recording, fitting easily into a pocket thanks to the case's compact 93 × 38 × 32 mm dimensions.