Data Sheet

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1. Product Introduction
1.1 Introduction
REX3B21 is a low-power ZigBee module with high sensitivity and compact in
dimension. Based on EFR32 platform of SiliconLabs, this module conforms to IEEE
802.15.4 specification and ZigBee3.0 protocol standard. It has been widely used in
applications of smart home, building automation and industrial monitoring. By utilizing
this module, much time and energy will be saved during the development work.
1.2 Application
REX3B21 module conforms to IEEE 802.15.4 specification and ZigBee3.0, supports the mesh
network which is self-healing and self-assembling, optimizes the network rate and power consumption.
This module supports the setting and configuration as below:
 Standard ZigBee 3.0
Application of module, included but not limited to:
 Smart home
 Light control
 Security system
 Air quality monitoring
 Smart lock
 Motorized curtain
 Air-conditioning, heating and ventilation
 Scenario automation
 Building automation and monitoring
 HVAC monitoring and control
 Industrial monitoring
 Wireless meter reading
1.3 Main Characteristics
 Dimension：20.4*14.8*2.5mm
 Max output power:14dBm
 Max receiving sensitivity: -102.5dBm(Zigbee)
 Reliable communication distance: 1000m（view of sight distance）