What’s the difference between single device and duo bundle？

The Duo bundle includes two Rootique Gen 2 devices in one set. You’ll save more money by purchasing the bundle instead of two individual units.

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What is included in the DUO bundle？ What is the key difference between the Rootique DUO (a micro-mist applicator) and a traditional derma roller? Can DUO be used with own topical minoxidil? Does DUO come with the minoxidil tonic if I buy it ? Why is only air coming out when I first start using it?