My friend in Cupertino had these on the shower head to stop water as soon as it’s hot: ShowerStart TSV 3 Hot Water... https://www.amazon.com/dp/B07WZQTWLG?ref=ppx_pop_mob_ap_shar.... Bought one and it’s pretty great to clear out long cold pipes

Our local power company sells these and other power/water saving devices at a roughly 50% discount over retail/amazon: https://www.dtemarketplace.com/collections/water

Very cool app. Being able to set the color is great in different light conditions.

Hi HN, I’m Erik CEO at Tesseract. Tesseract went through YC in Summer 2017 and builds in space propulsion. Please reach out if you have any questions