Looks like a new iteration with 2.4 GHz Wi-Fi added. I guess that's the "w". It looks like in the test report that laser transponders and the button controller are attached for what its worth.
R8w FCC AMWUA2402
R4w FCC AMWUA2401
Wi-Fi Bluetooth Combo Module
![1722528303148.png]( "1722528303148.png")
![1722528380237.png]( "1722528380237.png")
R8w FCC AMWUA2402
R4w FCC AMWUA2401
Wi-Fi Bluetooth Combo Module