The 8 Channel Voice Recorder Playback Module APR33A3 interface the speaker pins and power on the module, slide the switch towards the recording option, then press and hold the m1 button and speak near the microphone then release the button m1. To playback the recorder message, slide the switch towards playback and then just click the m1 button, the recorder message will be played. Repeat the same procedure to record the different messages on the different channels from m1 to m8 to interface with arduino, 8051, pic and any of the other microcontrollers, solder the berg header and interface it to the port pins directly, and send active low signal to active the button, the low signal period width depends on the time duration of the message to be recorded and single low pulse to playback.