The Beta Xenon Development Kit (XeDK) was the successor to the Alpha PowerMac G5 XeDK. There were many different versions with the internal hardware varying between each version.
The Beta XeDK was succeeded by the first final Xenon XDK.
Beta XeDKs were used for internal development of the Xenon hardware with later Beta XeDKs being sent to some game studios for early title development.
Beta XeDKs were later replaced with final Xenon XDKs. Microsoft required that studios return their Beta XeDKs after their use had ended. hey were intentionally damaged by Microsoft before and then shipped overseas with the intention of being destroyed.
Chinese sellers on marketplaces such as TaoBao began selling the damaged Beta XeDKs which is where the term "China Kit" originated from. These kits often came with destroyed AV/ethernet ports, missing sidecars and also had their serial numbers defaced with a disc grinder. With the ports being identical to the launch model Xenon, the damage was relatively easy to repair and were obtained by many different community members.
Nowadays the Beta XeDKs are mainly a collectible and aren't useful for any normal development work due to their unique pre-release hardware. With most kits being mistreated in their early days, finding a working kit is rare and should be avoided for those who aren't experienced with this kind of hardware.