The CSM Kaixa Phone XX is used by Masato Kusaka to transform into Kamen Rider Next Kaixa. That said, the Kaixa Phone XX is a smartphone with a touchscreen that has a 70mm x 42mm LCD display. Like all smartphones, it comes pre-installed with 15 apps, some are seen in regular smartphones like a "Clock App" and a "Music App", but it has apps unique only to the Kaixa Phone, namely the "Henshin App", "Stun Gun Mode App", and "Beam Mode App". To transform, the user taps in the Henshin App on the Kaixa Phone XX, which will open a keypad. The user then types in the code "9, 1, 3, ENTER", the transformation standby sound will play, and then you set it and push it down to the CSM Kaixa Driver (sold separately) to transform into Kamen Rider Next Kaixa.
As previously reported, the CSM Kaixa Phone XX is included in the CSM Kaixa Phone Edition and the Complete Edition Blu-ray and DVD release of the Kamen Rider 555: Paradise Regained film, which are both set for a September 13, 2024 release. The Complete Edition Blu-ray cost 33,550 yen, while the DVD version cost 32,450 yen. The CSM Kaixa Phone Edition Blu-ray cost 30,250 yen, while the DVD version cost 29,150 yen. Pre-orders for all items will end on February 14, 2024.