♬Adopting an all metal casing ensures the stability and durability of the pumps, allowing for long term use in various environments. ♬Equipped with an 8mm two phase four wire stepper motor, phase resistance of 22 ohms, voltages of 5V, current of 150mA, achieving high precisely quantitative output. ♬Supporting positive and negatives changes in water flows direction, flexibly meeting different operational needs, and facilitating diversified applications. ♬Using 2.5mm silicone tubing, it has good resistance and elasticity, suitable for transporting various liquids. ♬The driving voltages ranges is between 3-5V and supports single 3.7V battery power supply. Low voltages may affect the motor speed and flows output.