Amazon.com: Mcbazel Playstation 2 Controller to USB Adapter for PC or Playstation 3 Converter Cable for Sony DualShock PS2 PS3 Controllers (NOT Compatible with Dancing Mat Guitar Hero) : Video Games
Brook Super Converter Adapter for PS3 PS4 to PS2 Controller Adapter use PS3/PS4 Fightstick Gamepad Play on PS2 Console _ - AliExpress Mobile
Playstation 2 Bluetooth Controller Adapter | Bluetooth Adapter Ps2 Bluetooth - Ps2 - Aliexpress
PS1/PS2 Controller to PS3/PC/MAC Adapter - Tomee - Stone Age Gamer
Amazon.com: Brook Super Converter - PS4/3 to PS2/1, Support Switch Pro/Xbox One/ PS5/ PS4/ PS3 Controllers on PS2/ PS1/PS Classic, Retro Consoles Controller Converter : Video Games
Wingman PS2 Adapter for PS1 / PS2
Amazon.com: XBERSTAR for ps2 Bluetooth Adapter ps1 Bluetooth Adapter Wireless Controller Converter Controller Adapter Supports PS2 PS1 Game Console (White) : Video Games
After 5 different bluetooth adapters, I finally found one that lets me use two controllers at the same time with pademu! - Link included : r/ps2
Wingman PS2 – Brook Gaming
Blueretro Multiplayer Wireless Controller Adapter for PS2 PS1 Compatible with PS5 PS4 Switch XBOX One 8 bitdo Controller – Bitfunx