1. Download the file to adjust the volume, the value is large, the volume is large 2. Micro-USB interface, when connected to a lithium battery can be charged directly to the battery 3. Greeting card module with 8M memory capacity, keypad/light sensitive models available 4. Super power saving module, standby power consumption 0 5. Free to set the playback mode Brief description of functions: 1. The module comes with its own memory, 8M optional, with its own USB interface, plugged into the computer directly display U disk, you can freely delete, replace any MP3 audio files. 2, can be external key, through the key control playback, free to set the playback mode, loop or not loop. 3,Can be connected to a photoresistor, with light to play, no light to stop, free to set the cycle or not cycle. 4,Power supply voltage: DC3.4-5V, can be connected to lithium battery or dry battery. 5,Ultra low power consumption design, no work, standby power consumption is "0". Interface Description 1,USB: connect to computer to download mp3 audio files through Micro-USB data cable, when connected to lithium battery, it can charge the battery directly. 2,Charging indicator: the indicator is always on during charging, and the light is off when it is full. 3,Playing indicator: always on during the process of playing voice. 4,Support downloading multiple voice files, each time trigger to play the next voice. Colour:As Shown Material:PC+Metal Package Contents: 2 x Music Recordable Recorder Board Module