Dual sensing - Charge from the start and auxiliary allows access. The VSR detects the voltage of both the start & auxiliary allowing it to engage or isolate depending on the battery's voltage level.
“Never received and was refunded, none in stock. Looks like a scam to hold buyers funds indefinitely. No further communication to say the product is available”
“Awesome little unit. I didn’t think this unit would work well especially for the price but it works a treat and will also put one in caravan as well. Don’t get fooled by the low price. It’s a very well made unit I opened it is to check and it’s completely epoxy sealed and well built. Highly recommended and awesome bang for buck. Super handy with the override switch”