I bought this product to use a replacement Chromecast on an old TV. I plugged it in and it worked; However, everything was in B&W. I tried it with Firestick and got the same result. When I researched this issue, it turned out that this adapter doesn't fully adjust the HDMI signal so you can see it in color. I'm returning it and trying another one (https://www.amazon.com/HDMI-Converter-Google-Chromecast-Composite/dp/B00Z81EY8K?ref_=nav_signin&). This ensures that it works with Chromecast and Firestick.
HOMELYLIFE 600W High Power Voltage Reducer DC 48V 60V 72V Step Down To DC 12V 50A Buck Converter Waterproof Module Car Truck Power Regulator Transformer
12 Review
Germany France Travel Power Adapter,TESSAN Schuko Plug With 2 USB Ports 2 AC Outlets, US To European Europe German French Spain Iceland Norway Russia Korea Adaptor(Type E/F)
17 Review
Dorhea LM2596 DC-DC Buck Converter Step-Down Regulator 4.0-40V To 1.25-37V DC 36V To 24V To 12V To 5V Volt Power Supply Module With LED Voltmeter Display Compatible With Car Motor Buck
16 Review
DC/DC 12V To 24V Boost Converter 40A 960W - Waterproof Voltage Regulator Module For Car Power Supply (10V-16V Input)
15 Review