Size: 20.4x14.8x2.3mm（With Shielding Cover）
Operating TEMP: -40°C to +85°C
Application: Security sensor,Fire sensor
REX3B137 is a compact and highly sensitive Zigbee module that complies with the IEEE802.15.4 specification and Zigbee 3.0 protocol standards. The module has built-in PA, and integrates 64KB RAM, 512KB Flash, 12-bit ADC, PWM and rich GPIO resources.