1、Recording REC means that pressing and holding the REC button makes that the LED will light up. At this point, When you speak to the MIC, the content will be recorded in the ISD1700 voice chip. After recording a paragraph, the LED will be turned off at the same time. Pressing again can start recording the second segment. And the subsequent segments will be operated in sequence. 2、You can press playback PLAY, and there are two ways incleding edge trigger and level trigger. (Note: After recording the sound, the playback pointer will stay at the start address of the last recorded segment, at this time the playback will put the last segment) (1) Edge trigger: you can click the PLAY button to put the current segment, while playing, the LED flashes during the period until it stops at the end of playback. After the playback ends, the playback pointer points to the start address of the segment just placed, and you once again press the PLAY button to place the segment that just finished. (2) Level trigger: you can press the PLAY button frequently to play all the voice messages and cycle until that the button is released. 3、Fast forward FWD can be operated in the following way. Before performing the playback operation, you can click this button and the playback pointer will point to the next segment. Pressing twice means that it points to the second segment after the segment. Clicking this button during playback can stop playing the current segment and then play the next segment. If the current segment is currently playing, it will stop playing the last segment and play the first segment. 4、ERASE button can be pressed in the following way. The single-segment erase operation can only be valid for the first and last segments. When the playback pointer is in the first or last segment, clicking this button erases the first or last segment. And the playback pointer will jump to the second or last second segment before erasure. Pressing this button for more than 3 seconds can enter the "all erase operation mode", and the LED light flashes twice. If you continue to press this button, the LED flashes 7 times and then goes off. At this time, if you release the button and the voice information in the chip is erased totally. 5、Clicking RESET button can perform a reset operation. After resetting, both the playback and recording pointers point to the last segment, it means that the playback pointer points to the beginning of the last segment, and the recording pointer points to the end of the last segment. At this time, the last segment is played while the playback is performed, and the last segment is started after the last recording. 6、Tuning VOL is that tapping this button can adjust the size of the chip output sound. The default output of the chip is sound. When you press it each time and the sound is attenuated by 4db. Until the sound is small, you continue to click this button, each click will make the sound increases by 4db (Note: after the reset is performed, the sound output is large). 7、FT pass-through operation means that you can short-circuit the FT pin to GND and keep it low to initiate the pass-through mode. The pass-through operation will directly make the voice from the Analn terminal to the speaker or AUD output. During recording, if FT is pressed, the voice signal entered by Analn will be recorded at the same time. 1 x Recording and Playback Module Item Type: Recording moduleSize: Approx. 5.5CM x 5CM / 2.2 in x 2.0 inPower Supply: 5VRecording Time: 75 seconds at 6K, 60 seconds at 8KChip Operating Frequency: 6KHZ and 8KHZ can be selected.Indicator Light: With power indicator light and chip indicator light