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We do not recommend powering the Interface from a Mains outlet. 

The device has been primarily designed and tested to work with USB bus (roughly 5v) and anything else could potentially damage the device. 

If you do use the device from a mains outlet and the device develops a fault then you will have voided any outstanding warranty. 

Please refer to the specifications section in the Quick start guide for more information; 

https://mediadl.musictribe.com/media/sys_master/h70/hd5/8850095407134.pdf