This is just the attractant, available here

VOSCA WaspGo Pro is intended for catching queens of wasps and hornets in the spring (March-May). This is to prevent nuisance in
to avoid the summer.

• Pour 125 cc of a bottle of bait liquid into the colored (yellow) bottom and then fill it up with water to 500 cc
• Twist the clear top onto the trap
• Insert the yellow attractant holder as a closure in the top and hang the trap
• Hang the trap at a height of 1 to 2 meters from the ground
• Never hang a trap in the open field, but in the shelter of a wooded bank or wall where the evening sun shines
• Check after a few weeks
• Empty and refill after +/- 6 weeks
• One bottle can fill a trap 3 times
• Bottles may be under pressure, open with caution
• Remove traps at the end of May

Technical info