It is 2.4GHz 63mW (+18 dBm) XBee PRO ZB module P/N:
XBP24-Z7WIT-004 from Digi International Inc. It can communicate up to 2 miles RF LOS range. It is the most simple way to communicate serial (UART) over secure wireless network.
XBee ZB embedded RF modules provide cost-effective
wireless connectivity to devices in ZigBee mesh networks. Utilizing the ZigBee PRO Feature Set, these modules are interoperable with other ZigBee devices, including devices from other vendors*.
Products in the XBee family are easy to use. They require no
configuration or additional development; users can have their network up and running in a matter of minutes.
*Interoperability requires the ZigBee Feature Set or ZigBee PRO Feature Set to be deployed on all devices. Contact Digi Support for details.
Features:
• Low-cost, low-power mesh networking
• No configuration needed for out-of-the-box RF communications
• Support for larger, more dense mesh networks
• 128-bit AES encryption
• Frequency agility
• Over-the-air firmware updates (change firmware remotely)
• ZigBee mesh networking protocol
  - Improved data traffic management
  - Remote firmware updates
  - Self-healing and discovery for network stability
• Low-power sleep modes
• TX current: 205mA @ 3.3V, RX current: 47mA @ 3.3V, Power-Down current: 3.5uA @25 degree C
• Industrial temperature rating (-40C to 85C)
• 1Mbps Max data rate
• 63mW output (+18dBm)
• (4) 10-bit ADC inputs
• (10) digital IO pins
• 128-bit AES encryption
• Local or over-air configuration
• AT or API command set
• Fully FCC certified
Documents:
XBeeZB Datasheet
XBeeZB Manual
XBeeZB Mechanical Drawings
Digi Product Page
X-CTU Software
X-CTU User Guide
