1. USB: You can download MP3 audio files by connecting to a computer via a MICRO-USB data cable. 2. Charging indicator light: The indicator light stays on during charging and turns off when fully charged. 3. Play indicator light: It remains on during voice playback. 4. Supports downloading multiple voice files; each file plays when triggered. 5. 8MB memory, with approximately 1 minute of audio per 1MB; volume is adjustable; the product includes a 3.6V button lithium battery and can be charged via USB. Model: JR1652 Compatible audio device types: Speakers, digital-to-analog converters, players Memory size: 8MB Product name: USB sound module box Sound format: MP3 Playback time: Up to 8 minutes Functions: Sound effects, greeting messages, or recorded audio Battery: Rechargeable 3.6V button lithium battery (included) Color: White Material: Plastic + PCB Version: B: Keyboard Version Package Contents: 1 x USB sound module box Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.