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; includes a 3.6V rechargeable button lithium battery, chargeable via USB. Model: JR1652 Compatible devices: Speakers, digital-to-analog converters, players Memory size: 8MB Product name: USB Sound Module Box Audio format: MP3 Playback time: Up to 8 minutes Functions: Plays recorded sounds, messages, or greetings 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: The package includes only the items listed above. Other accessories are not included. Note: Lighting effects and display settings may cause slight color differences between the image and the actual item. Measurement error allowed within +/- 1-3 cm.