Experience professional-quality broadcasting with the HDR-831 Portable Stereo Digital FM Transmitter, designed for versatility and convenience in any setting. Long-Lasting Performance: Enjoy up to 20 hours of continuous working time, making it perfect for extended events, tours, or training sessions without the need for frequent recharging. Flexible Audio Options: Easily switch between mono and stereo audio channels with a single button, and adjust the sound to your preference with 16 different sound levels for optimal clarity. Multiple Input Ports: Equipped with separate AUX input and MIC input ports, this transmitter allows you to connect various audio sources and microphones for a seamless broadcasting experience. Adjustable Frequency Range: The frequency can be adjusted from 60-108MHz, and you can also set it to a fixed frequency for stable and interference-free transmission. Powerful Transmission: Featuring a specialized antenna, the HDR-831 delivers a stable and clear signal with a transmission range of up to 500 meters, ensuring your message reaches your audience effectively. User-Friendly Features: The key lock function prevents accidental changes during use, while the TF card slot offers additional audio playback options for greater flexibility. Wide Application: Ideal for tourist guides, training courses, travel, study activities, and more, this mini FM radio station is a reliable solution for any group communication needs. Upgrade your broadcasting experience with the HDR-831 Portable Stereo Digital FM Transmitter and enjoy clear, stable, and long-range audio transmission wherever you go.