Package includes: 1 piece of pump The product will be upgraded constantly, the appearance and color may be changed, please don& x27;t mind. And take a consideration before place the order if you have request for color or appearance. Model: CJWP27 Type: 370 self-priming water pump (with flow detection board) Applicable voltage: DC 5-12V Rated voltage: DC 12V No-load current: 3 meters Head:> 3 meters Maximum water pressure: >210kpa Noise: <60dB Adapted water pipe: 8x6mm Blue standard 370 water pump, power on 12 volt test, when idling, there is a whistle sound, which is normal; when pumping, it is much quieter, the flow rate is not large, about 800 ml per minute; The suction range and head are amazing I thought that cutting 3 meters of water pipes would be enough, but the water rushed out directly, and I concluded that they were all larger than 3 meters Water can be pumped in the voltage range of 5 to 12 volts, but the flow rate of 5 volts is smaller. The attached 4-pin circuit board is estimated to be a photoelectric switch, used to detect the operation of the motor, so as to achieve the purpose of measurement.