The RP Mini Semen Storage Cooler is the perfect size unit for a handful of bottles or tubes for your swine project. This thermo-electric unit has a 4L capacity and will hold approximately 8 doses. The unit?will cool to maintain an ideal temperature for semen storage. Nothing to calibrate, the unit is preset to 63F.? ?? NOTE:?RP Mini-Cool units are designed for indoor use only,?in a controlled environment (for example at room temperature of 70F), the unit is not?capable of operation in? extreme temperatures.??