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 is always on during charging,and the full light goes out. 3.Play indicator light:It is always on during voice playback. 4.Support downloading multiple voice files,and the next voice will be played each time it is triggered. 5.8M memory,1M can store about 1 minute of audio files;the volume can be adjusted;the product comes with a 3.6V button lithium battery,which can be charged via USB. Model:JR1652 Compatible audio and video device styles:speakers, digital-to-analog converters (DAC), players Memory size:8M Product name:USB sound module box Sound format:MP3 Music time:8 minutes Function:play music or sound, blessing words, play music or sound Battery:rechargeable 3.6V button lithium battery (included) Colour:White Material:Plastic+PCB Specification: B: Keyboard Version Package Contents: 1 x USB sound module box Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.