L2 R2 Buttons Extension Trigger Extenders Extend Button 1 Pair For PlayStation 4 / PS4 Slim / PS4 Pro DualShock 4 DS4 V1 V2 Controllers - Black
How to tell the difference between V1 and V2 Dualshock without opening the box? : r/PS4
DualShock - Wikipedia
PS4 Controller questions - differences in production? how to differentiate V1 vs V2 (also Packaging?) | NeoGAF
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