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; the next voice file plays each time it is triggered. 8MB memory, 1MB stores approximately 1 minute of audio; volume is adjustable; includes a 3.6V rechargeable button lithium battery that can be charged via USB. Model: JR1652 Compatible audio and video device types: Speakers, digital-to-analog converters (DAC), players Memory size: 8MB Product name: USB sound module box Sound format: MP3 Playback time: Up to 8 minutes Function: Play music or sound, greeting messages, audio playback Battery: Rechargeable 3.6V button lithium battery (included) Color: White Material: Plastic + PCB Specifications: A: Light Control Version / B: Keyboard Version Package Contents: 1 x USB sound module box Note: Light reflection and display differences may cause slight variations in color between the image and the actual item. Measurement error allowance is +/- 1-3 cm.