1. When the module has detected a key pressed, the corresponding port will output a low level signal;
2. Independent button with large size 12mm × 12mm × 5mm (7.3 mm +12 mm) , easy to use;
3. The module comes with LED power indicator, it will light up after being powered on.
4. Power supply voltage input range: DC 3~6V
5. Working temperature: -40 to 75 degrees Celsius