Part of the XBee family of wireless products, these modules are easy to use, share a common footprint, and are fully interoperable with other XBee products utilizing the same technology. This allows different XBee technologies to be drop-in replacements for each other; you can switch between 802.11, 802.15.4, ZigBee, DigiMesh and proprietary long-range with minimal development time or risk.
Series 2 modules use a different hardware configuration from the earlier models. They are not compatible with the outdated ZNet Series 2.5 modules. You can, however, change the firmware of existing ZNet Series 2.5 modules to the new ZB Series 2 firmware.