Power Integrations interview questions

Received a phone call instead of an email letting me know they like to interview. Phone screening was typical, however they wanted to do a technical interview on the same day. Was very, very short-notice and only had 30 minutes to prepare in between. Technical questions were mainly conceptual. The most aggravating part of the interview was how they were constantly suspicious of me using a second device due to "shifting eyes", often interjecting and asking for a photo of my desk. Very unprofessional. I have dignity.