Package include:
Metal detector module kit x 2
Metal detector kit instruction x 2
Operating Voltage: DC3-5V

Test: The machine is powered by 3 to 5V direct current and connected to the power supply, turn on the power switch,

LED bright, adjust potentiometer make LED not bright, potentiometer affect detection distance,

the machine detection diatance is less than 6 centimeters, detect object size and environmental impact detection distance.