The PS4 DualShock 4 GamePad Is Now Bluetooth Compatible with the PS3 | Time
Can You Play PS3 Games On PS4?
Amazon.com: BRHE Phone Clip for PS4 Controller Mobile Gaming Mount Bracket Holder Adjustable Stand Clamp Compatible with iPhone/iOS, Android, for Playstation4 Remote Play (Black) : Video Games
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PS4 Backwards Compatibility Explained
Is The PS4 Backwards Compatible?
PlayStation 5's DualShock 5 will be backwards compatible with PS4 consoles - Daily Star
PS5 backward compatibility: PS4 games list, USB external drive support - Polygon
DualShock4 To Be Backwards Compatible With PlayStation 3 | eTeknix
PS5 Reportedly Features Controller Backward Compatibility