This manual provides instructions for assembling the CTR2-Quad Upgrade Kit. This kit is intended for customers that already own an M5Dial controller, or want to upgrade from older CTR2-Dial or CTR2-Flex to the latest design. It’s also a good option for international customer that want to save the additional USD 10 charged to cover the higher shipping cost of CTR2-Quad because it’s heavier than 8 oz.