These things sometimes accompany bonsai tool sets. They're mostly useless. It's a squeeze watering bulb, can be used to apply targeted fertilizer, etc.
Like I said, pretty useless.
Bonsai Tree Bulb Watering Sprinkler - Squeeze Bulb Super soft water shower is released upon gentle squeeze High quality item ideal for watering small trees indoors
www.kaizenbonsai.com
Looking for a watering bulb. I have seen them referenced in books and used in a bonsai video. Used to think they were pointless, uncontrolled, held too little water. Now as I am watering more inside I think I could appreciate the petite spray they could afford. Initial searches bring up the...
www.bonsainut.com