M5StickC Development Kit w/ HAT Offers 0.96 inch LCD screen Features a portable, easy-to-use, open-source, IoT development board Built-in 6-Axis IMU and Lipo Battery Provides Red LED, IR transmitter and Microphone Development Platform UIFlow, MicroPython, Arduino The M5StickC Development Kit w/ HAT is a mini M5Stack, powered by ESP32, which is a single 2.4 GHz Wi-Fi and Bluetooth combo chip and integrates a 4-MB SPI flash. It is a portable, easy-to-use, open-source, IoT development board. ENV HAT: It is able to detect the temperature, humidity, air pressure, and magnetic field. This product relates via I2C protocol which allows you to obtain 4 types of environment data thru just 2pins, together with the tiny body, which makes it a powerful application for environment data collecting. SPK HAT: is an M5StickC compatible speaker, integrated PAM8303 amplifier (3w single-channel type D power amplifier), High PSRR and Different inputs eliminate noise and rf interference, thus it has the characteristics of simple functions and high audio reproduction.