USB: You can download MP3 audio files by connecting to a computer via a MICRO-USB data cable. Charging indicator light: The indicator light stays on during charging and turns off when fully charged. Play indicator light: It remains on during voice playback. Supports downloading multiple voice files; each file plays when triggered. 8MB memory; 1MB stores approximately 1 minute of audio; volume is adjustable; includes a 3.6V rechargeable button lithium battery, chargeable via USB. Model: JR1652 Compatible audio device types: Speakers, digital-to-analog converters, players Memory size: 8MB Product name: USB sound module box Audio format: MP3 Playback duration: Up to 8 minutes Functions: Sound playback, greeting messages, audio recording 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 screen differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.