AD828 Stereo Dynamic Microphone Preamplifier Board MIC Preamp Module For 3.8VWorking voltage:DC3.7V-15VUltra-small dynamic microphone preamplifier board,two-channel design,suitable for a single lithium battery-powered,using AD828 fever op amp chip,suitable for low voltage power supply (3.7-15V)Note:This microphone amplifier board without power regulator circuit,can only use the linear power supply,can not use switching power supply,otherwise there will be If you only used one channel,the other channel needs to short-circuit the input with GND,To avoid with the crosstalkSize:3.2x2cm/1.3x0.79inchNote:Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bidDue to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Packing List:1x AD828 Stereo Dynamic Microphone Preamplifier Board