可考慮用左2，PIR passive infra-red detects animals, switching on light and sound to scare animals
Solar Ultrasonic Animal Repeller, Cat Repellent, Motion Detection, Siren and Flash Repel. Dog, Squirrel, Deer, Raccoon, Skunk, Rabbit, Fox, etc：
https://www.amazon.com/Ultrasonic-Repeller-Repellent-Detection-Squirrel/dp/B083414J18/ref=sr_1_3_sspa?hvadid=581065443562&hvdev=c&hvlocphy=9003394&hvnetw=s&hvqmt=b&hvrand=12697003786686343252&hvtargid=kwd-349261862314&hydadcr=22685_10212065&keywords=motion+sensor+to+scare+animals&qid=1682858851&sr=8-3-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyVUhETUY4QTdSM0JXJmVuY3J5cHRlZElkPUExMDQ2NzMwMkNBQTdWWEI2WjhMSiZlbmNyeXB0ZWRBZElkPUEwMTgxNjg4MVhKVDY3OEI1VVVYOSZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=
https://www.youtube.com/results?search_query=Solar+Ultrasonic+Animal+Repeller%2C+Cat+Repellent%2C+Motion+Detection%2C+Siren+and+Flash+Repel.+Dog%2C+Squirrel%2C+Deer%2C+Raccoon%2C+Skunk%2C+Rabbit%2C+Fox%2C+etc
https://www.youtube.com/watch?v=DbeRlQQXJj4
或
https://www.ebay.com/itm/204170879222?hash=item2f898860f6:g:PwQAAOSwog9jh~h0&amdata=enc%3AAQAIAAABAC7fQTQLNG6iuaqppL77axGnYB6nG1b954tJaJvbMSNsFUce0BW%2Famslfcwzl2yMmuj5laixC886dEB8CMR20SV4oJZSJ8OuslvrQRXgp%2FVCXly5LxTss3f%2BQ64e3JqYxp62Af6fAK0SaCIKq4%2FHF2L11MzvPpktlg2kfgtvqNuaRC5n5ZTFMgdV14R83aVgJW0tUQ93ApFstbgHUKC5QXuiYgLtrA%2F1Va%2BGRAtDHFBb2cxmk2lX41C7Tmdhor56GRapUcCDpEhFu%2B0HD4CCuT1Q4RaLcNvhByEXTOVT0Ke4Nd19oO08DU9CGCgS7LAddycj%2FkcBBll9lilJwxtvCvo%3D%7Ctkp%3ABFBM-oCRpPph
this was bought several years ago (bought from eBay, 不記得名字了：
