Good question, I'm new to this. I saw Holosun auto ON on shack, but on this Venow I cannot find auto ON feature. The only auto mode is brightness. I hope someone will explain how this works. I think it should always be ON or auto ON otherwise does not make sense for EDC.
From manual: "The Venom red dot has two brightness modes, Auto and Manual. Auto mode will increase or decrease in brightness depending on the ambient lighting conditions. In auto mode, the unit will power down after 14 hours to save battery life. Manual mode is controlled by the up/down buttons and will not power down automatically."