Grodan 1.5 in Starter Mini Blocks MM40 40 1.5 in x 1.5 in x 1.5 in Case of 2250 Trolmaster the ARS 1 will send those Quest the ARS 1 will send those same signals to the indoor mini split head unit changing the set point to the desired Day or Night temperature setting automatically base on the photocell sensor status though the Stealth Ventilation inline fans match to most popular brands of ducted filtration Remove wrapping and transplant into any loose media such as Grow Cubes™ or coconut fiber or leave wrapping on and set on top of a larger Gro Block™ These Mini Blocks™ are individually wrapped in white plastic to minimize algae growth