inputs.text: whistle drive - effective market price right get fifth star not attained due false positve try afler indication 05 not anything system second attempt read accurate 000one thing must take deep breath release air top device around ten seconds test stops results displayed stop blowing device take short breath continue 34 seconds experiencei teenagers never use get truth since mental deterrent well couple years 21 others legal age consume use driving suspicions bought device test friends etc fyi best results come blowing device lips positioned whistling hope helps someone terry