Features:Dual MCUs :TLSR8258 Ultra Low Power chip and ESP32-C3 chip.More information:github.com/Xinyuan-LilyGO/T-ZigBee.This product needs the T-U2T automatic downloader to upload the program.brand new and high qualityESP32-C3: Rev3.Support 2.4 GHz Wi-Fi and Bluetooth-compatible 5(LE).Package Includes:1Set x T-Zigbee with downloaderor1Set x T-ZigbeePA with downloaderSpecifications:MCU 1:TLSR8258 ultra-low-power MCU supporting zigBee and BLE5Wireless:Support BLE 5 Mesh,Zigbee,RF4CE,Thread6LoWPAN,HomeKit,ANT 2.4GHz proprietary standardWith DMIC,6-channel PWM functionProgrammable LED:Red LED:PD04 Green LED:PA00MCU 2:ESP32-C3 Equipped with RISC-V processor SocSupport 2.4 GHz Wi-Fi and Bluetooth-compatible 5(LE)Main frequency 160 MHz,built-in 400 KB SRAM,384 KB ROMProgrammable buttons:1002 Blue LED:1003Size: approx. 75x29mm/2.95x1.14inStyle: for T Zigbee with downloader , for T ZigbeePA with downloader(optional)note:Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you