Bought new Quadro Pack and only needed 3. Supplied in plastic wrapping and sealed bag of 4 x set of adapters. The tado° app is very fast and well designed. Works with Alexa, Siri, and Google Assistant. Installation is straightforward and easy. Compatible with horizontal and vertical valves. * Requires the tado° Internet Bridge which works with Apple HomeKit, Amazon Alexa, and Google Assistant.
eBay