Minnesota Department of Transportation

511 Travel Info

Approved/Qualified Products

Audible Message Devices (AMD)

AMDs without a pushbutton

Product Name Manufacturer Approval Date
Model 400ADA Audible Device Empco-Lite 1/26/2018

AMDs with a pushbutton and locator tone

Product Name Manufacturer Approval Date
SpeakMaster 500 MDI Worldwide 6/21/2018