Features: T-ECHO GPIO expansion module, can be inserted directly in the GPIO interfaces. GPIO interfaces adapter module can be used for interfaces transfer and interfaces extension. Made of quality material, which is durable with long service life and stable structure. Match with MPU9250 module(not included), it can supports expansion in T-ECHO, TTGOseries, T-watch2019 and t-camera Plus. Easy to use, perfect fit. Package Includes: 1x T-echo GPIO Expansion Module(MPU9250microphone and MPU9250 module not included) Specifications: Main Material: ABS Size: Approx. 3.7x2.0cm/1.46x0.79 inch note: Please allow 0-1cm error due to manual measurement, make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.