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Ximimark 2Pcs ISD1820 Sound Voice Recording Playback Module Sound Recorder Board With Microphone Audio Loudspeaker Specifications: Size: 38mm*42.5mm (1mm=0.0393inch) Working voltage: DC 3-5V, can be connected to the pin power Button control recording and playback operation method: REC button: Record button, press and hold to record, release button..