I got the T4 with 67 control for under $100 on ebay. The listing had a contradiction and I didn't know what control I was getting. No part numbers at all on the control but I finally determined it was the 67. I called and they said they are "transitioning" to the 67. My guess is they started shipping with the 67 and they didn't say anything as there are still T4's on shelves with the older UNC529.
The controls DO look identical except the 67 has a gear/settings symbol on the right button and the old UNC529 has a leaf. I never even saw that part number until very recently, they did a good job of making things confusing.
The new control is 69 and uses USB-C connectors rather than Molex. I wonder if fans etc, will be available with with the 69 control?
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Your source to create smart growing systems with components including advance grow tents, inline fans, clip-on fans, LED grow lights, and UIS™ controllers.
www.acinfinity.com