"XBee and XBee-PRO 802.15.4 OEM RF modules are embedded solutions providing wireless end-point connectivity to devices.
These modules use the IEEE 802.15.4 networking protocol for fast point-to-multipoint or peer-to-peer networking.
They are designed for high-throughput applications requiring low latency and predictable communication timing.
XBee modules are ideal for low-power, low-cost applications. XBee-PRO modules are power-amplified versions of XBee modules for extended-range applications.
Part of the XBee family of RF products, these modules are easy-to-use, share a common footprint, and are fully interoperable with other XBee products utilizing the same technology.
Module users have the ability to substitute one XBee module for another with minimal development time and risk.
XBee products are part of Digi's range of Drop-in Networking solutions, offering users seamless wireless communication between devices, including adapters and gateways."

Source: http://www.digi.com/products/wireless/point-multipoint/xbee-series1-module.jsp#more

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