I have the in-home device. I have COPD. It took me 45 minutes to an hour to blow each time 3x a day. You have to blow in for 3 beeps, suck back in for 2 beeps, and then blow back in for 2 beeps and then you're done. So if you have any respiratory problems or lung problems I would recommend Smart Start. I had to switch to Smart Start and I have had no issues or problems and their customer service is awesome. Also, Intoxalock customer service suck and their rules of payment. I was enrolled in auto pay biweekly. Well I lost my job and on the day they're going to take a payment from me I wouldn't have the money until 5:00 p.m. Get paid and go to bank ATM to deposit money and then pay them. I asked to be taken off auto pay for this time and they would not. they told me that I would have to pay a one month full total balance before doing that. I was like are you kidding me. It is easy with Smart Start. It is portable so I can take it with me and I can blow when need to. Just me 2 cents.