KR501 is fingerprint control board with fingerprint module.

DC3.7-10V, High Level output, Output:1 second, 3.3V-500mA
 

Technical Parameters:
·Fingerprint Capacity: 20
·Working Voltage: DC 3.7-10V
·Standby Current (excluding external equipment): 2.5-7uA typical value: 3uA
·Working Current (excluding external equipment): 40-250mA typical value: 45mA
·Output: 1second, 3.3V-500mA
·Low voltage alarm: ≤4.8V
 

Pin Definition:
Pin 1: VCC, Power + 3.7-10V
Pin 2: GND, Power - Ground
Pin 3: NC
Pin 4: OUT1, 1 second, 3.3V-500mA
Pin 5: INIT_KEY, Initialize key,long press low level trigger
Pin 6: NC