Smart Start is the #1 Ignition Interlock Device provider in Watertown with same-day installation available for your vehicle. We’re a convenient and affordable Wisconsin IID supplier located in Central Watertown at 315 Hart St with mobile services and price matching available to give you the best value. Our reliable customer service experts and licensed technicians will make your IID device experience quick & low stress. Smart Start is ready to schedule your Ignition Interlock Device installation in Watertown. Call our Central Watertown location & talk to a Program Advisor, who will help you schedule an appointment for your IID installation, calibration or removal.