NanoGong 4 is a Moodle activity module and HTML filter that allows students to record and submit voice recordings for various activities. It benefits students by letting them practice fluency and receive feedback through recorded submissions. Teachers can use it to record directions for students or make copies of recordings at different speeds. The module integrates well with Moodle and allows unlimited recordings to be submitted with duration and number limits set by teachers. Key benefits are its ability to include audio in many Moodle activities and provide feedback. The main downside is its support for a specific audio format and difficulty adjusting quality.