Source google image: https://ae01.alicdn.com/kf/HTB1yzx.LpXXXXXMaXXXq6xXFXXXx/Isolation-transformer-250W-full-copper-transformer-BK-transformer-250VA220V-to-220V.jpg_640x640.jpg
B&k isolation transformer
Source google image: https://ae01.alicdn.com/kf/HTB1yzx.LpXXXXXMaXXXq6xXFXXXx/Isolation-transformer-250W-full-copper-transformer-BK-transformer-250VA220V-to-220V.jpg_640x640.jpg