The E-Class is a Siren by the American Signal Corp. and is a Affordable Siren that contains Atlas Speaker Drivers..
On AmericanSignal.com it says:
the E-Class is a high powered configurable voice/siren.
The E-Class high powered voice/sirens are fully configurable for a wide range of alert signal tones as well as highly intelligible pre-recorded or live voice directions for community, industry, or DOD Mass Notification applications..