Features: 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 dual system, design for players who need frequent task-switching between two systems. for example, change Raspbain OS to Ubuntu OS. Plug and for play with micro slide switch to switching the system instead of changing 2 different micro TF card, simplifies your operation for 3 Model B/ 2B/Pi Zero /Zero for W Suitable for mostly for case which has tf card slot 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 for Case which has TF Card Slot. Package Includes: 1 x TF Card Adapter 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 power, then change the system, switch when power on will damage your system in the TF Card.