- High quality 2.1 channel power amplifier board with 220W+220W (350W) output, featuring AUX, Bluetooth, U disk, USB sound card and multiple audio input methods for flexible connectivity. - Bluetooth 5.1 with adjustable volume, mute (sound on/off) and timed shutdown for convenient control. - Playback and sound options: includes 10 natural lullabies and up to 1023 sound combinations; view the USB drive playlist, shake your phone to change songs, or use the dial/mode button to switch tracks. - Wireless performance: Bluetooth 5.1 delivers higher transmission efficiency, more stable connections and longer range; in open spaces, wireless range up to 15 metres (49 feet). - Use scenarios: - Home stereo setup: connect to external speakers via AUX or USB sound card for enhanced audio. - Nursery or kids room: play lullabies and soothing sounds for bedtime or playback variety. - Bluetooth music streaming in living room, garage, or workshop within the extended range, with easy USB drive navigation for local playlists.