SEN0496 Gravity - Oxygen Sensor - Current consumption

Hi Everyone, 

  Can someone tell me what is the current consumption of SEN0496 module? I'm looking for any information on this topic but without any progress. Maybe you use this sensor in your project? Or someone from DFROBOT has information about current consumption? Why 300mA LDO was used on this module? This is the maximum current consumption at 3V? How looks like average current consumption under measurements? 

Thanks in advance

Have a nice day