Multiple air vents and 6 drainage holes prevent water-logging and ensure optimal airflow-Removable tray with reservoir is designed to avoid frequent watering -Height adjustable and retractable hanger can adapt to different railings-3 planter boxes create roomy space to cultivate different plant species-Tiered design enables plants on each tier to receive sufficient sunshine -Space-saving wall-mounted planter can be directly secured on the wall(expansion bolts are included) -Can be hung on fence,