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Isolation 3 7
Source google image: https://ae01.alicdn.com/kf/HTB1r8hMKXXXXXawXXXXq6xXFXXX6/3-Pcs-Isolation-20W-AC185-277V-Dimmable-LED-Driver-7-20x1W-300mA-3-99-DC21-66V.jpg_640x640.jpg