Automatically squirrel-proof, there are no settings to adjust. Ideal for any mixed seed. The perch hatch moves downwards blocking off access to squirrels, large birds & rats. Then it returns to its open position. The design is easy to fill and comes apart for easy cleaning. Weather guards above each port prevent rain from entering. Stainless steel seed port protection plates prevent any chewing and pecking damage. UV stabilized materials. 3LBS capacity.