Specifications:

• Supply Voltage: 6-12VDC
• Frequency Range: 100-5500 Hz
• Output: 2.5Vpp/-25db
• Low noise
• High fidelity
• Wide working voltage range
• Low power consumption
• Long transmission distance

Features :

1. An easy to use 10 seconds of voice recording.
2. High-quality, natural voice restored.
3. Can be used as a propaganda module.
4. With looping, jog playback, single-pass play function.
5. Available single-chip control.
6. This module can directly drive a small speaker 8 ohms 0.5W.
7. Audio recording control mode: the key to control or microcontroller, IO has drawn the line of control.

Specifications:

1. Onboard LM386 Chip.
2. 200 multiplier benefits circuit design.
3. On-board speaker wiring Block.
4. On-board 10K variable resistor, you can adjust the volume of the enlarged.
5. Onboard power indicator.

Specifications:

1. Operating Voltage Range: 5V – 5.5V.
2. Max Gain: 24 dB
3. Current Handling Capacity: 8 mA
4. Efficiency: 87 %.
5. Amplifier: IC PAM 8403.
6. Load Can direct drive 4 or 8 ohm small speakers.

Specifications:

1. Operating Voltage: 3.3V to 5V DC
2. LM393 comparator with threshold preset
3. PCB Size: 3.4cm * 1.6cm
4. Induction distance: 0.5 Meter
5. Operating current:  4~5 mA
6. Microphone Sensitivity (1kHz): 52 to 48 dB

Specifications:

1. Working voltage: DC 3.3-5V.
2. Signal output indication.
3. The output is digital.
4. Single-channel signal output.
5. With the retaining bolt hole, convenient installation.
6. Output low level and the signal light when there is sound.
7. Comaptiable with Arduino Boards,esp 8266 .