Features: 100% brand new and high quality 2 in 1 TF/SD memory card adapter board, support 2 System for a board. Double micro TF card slot board for raspberry pi dual system, design for players who need frequent task-switching between two systems. for example, change Raspbain OS to Ubuntu OS. Plug and play with micro slide switch to switching the system instead of changing 2 different micro TF card, simplifies your operation Compatible with Raspberry Pi 3 Model B/ 2B/Pi Zero /Zero W Suitable for mostly case which has tf card slot Package Includes: 1 x TF Card Adapter Specifications: Model Number: Dual Micro SD/TF Card Storage Module Application: Computer Operating Temperature: -20 -65 Quantity: 1 pc Install Dual: TF Card Support: 2 System for A Board Suitable for: Mostly Case which has TF Card Slot. note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Please turn off your Raspberry Pi power, then change the system, switch when power on will damage your system in the TF Card.