Because this is a 100-volt Japan version. This item has been tested. 🙏 We truly appreciate your understanding and support!
eBay
HD 1080P AV to HDMI RCA To HDMI Composite Adapter Converter With USB Cable CVBS AV Adapter For N64 Wii PS1/2/3 Xbox One SNES etc
Aliexpress UK
Item sold as UNTESTED I have not got the means to test this here in the UK, this came with a Japanese N64 console that I now use with a UK power supply however I do happily accept returns no problem. overseas buyers welcome.
eBay
Replacement For XBOX Seires S / Series X XSS XSX AC Adapter Internal Power Brick Power Supply For Xbox ONE S / ONE X AC Adapter
Aliexpress UK
Item Type: N64. Model: N64. Platform: Nintendo 64. Type: Power Adapter. Platform Nintendo 64. Type Power Adapter. Location: #Z116. Condition: New.
eBay
RCA to HDMI Adapter AV to HDMI Converter Composite to HDMI Converter for PS1/2/3 Xbox N64 WII VHS VCR Blue-Ray DVD STB Adapter
Aliexpress UK
Item Type: N64. Model: N64. Platform: Nintendo 64. Platform Nintendo 64. They maybe marked, or have identifying markings on it, or show other signs of previous use. Location: #Z116 And #Z117. To Fit: Console.
eBay
USB Adapter Converter for Nintend 64 for N64 Controller Adapter 2 Ports Gamepad Gaming Converter for Switch/OLED Model PC Window
Aliexpress UK
Designed specifically for the Nintendo N64, this unbranded AC power supply adaptor ensures your console remains powered for extended gaming sessions. It features an American plug and comes in a sleek black finish that complements any gaming setup. The adaptor is compatible with the N64 model and offers a reliable AC/Standard power source.
eBay
N64 To HDMI Adapter Converter Nintendo64 to HDMI Converter Adapter Plug And Play For Nintend 64/SNES/NGC/SFC Gamecube Console
Aliexpress UK
Official Nintendo 64 N64 Power Supply Adaptor from Japan is a black wired AC adapter specifically designed for the Nintendo 64 console. Compatible with Japan, US, Canada Nintendo 64 consoles. Genuine Nintendo product, this adaptor ensures compatibility with the Nintendo 64 platform, providing reliable power supply for an uninterrupted gaming experience.
eBay
AV To HDMI RCA To HDMI Video Composite Adapter Converter with USB Cable CVBS AV Adapter for N64 Wii PS1/2/3 Xbox One SNES Etc
Aliexpress UK
N64 for AV Cable. One N64 Interface, One Yellow Video Cable with Left and Right Sound Channel Cable. 1 x For AV Cable. Cable Length About 1.6m/5.25ft. No Load Power Consumption：≤5%. If you do not receive our reply within 48 hours, pls.
eBay
Black AC 100V-240V Power Supply US/EU/UK Plug Adapter USB Charging Charger For Xbox One Console AC Adapter Brick Charger
Aliexpress UK
This HDMI-compatible converter makes it easy to connect the Nintend64 console to the new HDMI-compatible TV input, eliminating cable confusion. For Male Nintend64 to Male HDMI-compatible converter. 1 x HDMI-compatible Converter.
eBay
For Game Console N64 to HDMI-compatible Converter Adapter Plug and Play for SNES/NGC/SFC HDMI Adapter with 3.5mm Audio Output
Aliexpress UK