Do I need modules?
No. But, you have to have a NODE Sensor Platform in order for your sensor modules to work. NODE supports high-quality motion sensing, Bluetooth connectivity, USB connectivity, and more. NODE can run by itself and communicates motion-related data to your Bluetooth-enabled devices wirelessly. Adding modules (additional sensor attachments) only enhances your NODE. The modules run on the power provided by NODE and communicate with your smartphone or computer using NODE's connectivity support.