Using Wireless Blox, you can control all your Blox in the WitBlox kit wirelessly. This control block allows you to control any output in the range of about 100 metres. You can connect 5 Inputs (Buttons & Sensors) & 5 Outputs simultaneously. You need 2 Power Blox to use Wireless Tx & Rx Note : Power Blox purchased before 31st May 2018 are not compatible with Wireless Blox. You need to get 2 new Power Blox