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The Sentry 3V8 and 3V8-H are sirens manufactured by Sentry Siren.
Sound output/power[]
The 3V8 puts out 107 decibels of sound, while the 3V8-H puts out 109 dB. The motor on both sirens is rated at 5 hp. These sirens are available in either single-phase or 3-phase configuration.
Pitch[]
The 3V8 and 3V8-H put out a 460Hz tone.
Features[]
Both sirens are electromechanical and stationary.
Telling them apart[]
The 3V8 can be distinguished by its "skirt", while the 3V8-H has horns similar to the STH-10.