The feeder is placed on the store, and the bees climb up the slit to the syrup. Transparent plexiglass prevents bees from leaving the trough and drowning in syrup. The inner bottom of the trough has a slight slope, which allows the bees to take in every last drop of syrup. There is a "5 liters" mark on the inside wall of the trough. In total, the trough is designed for 10 liters.