Wireless microphone system with internal recorder. Official description says 20 hour battery life, but they include the charger box for that. It's probably closer to 6 hours.

Enhance your audio recording experience with the ULANZI AM18 Wireless Lavalier Mic. This microphone receiver is perfect for professionals in the music and entertainment industry who value noise cancellation and high-quality sound. It has a 20-hour battery life and an internal recording feature that makes it easy to capture audio content on the go. The ULANZI AM18 is a wireless device that allows for easy connectivity and freedom of movement during recording. This microphone receiver is suitable for various applications such as live performances, interviews, and podcasting. Its compact design and durable build make it a reliable and efficient tool for any audio production needs.