S-168M Audio Hailer
http://www.armyproperty.com/nsn/5830-01-073-558716 Watts Output
Range: 1200 Yards / 1098 Meters
Color: Two-Tone Blue
125db at 10 feet/3.0 meters
http://www.audiomegaphone.com/p-s-168m.htmProfessional hand-held unit. Very strong and clear solid-state amplifier. Less than 1% distortion. Pistol-grip trigger operation with volume control. Used by police, fire, municipal, military, governmental authorities, and industry. Optional penetrating, two-tone siren, order as Model S-168SS.
S-197 Type II Medium Duty
http://www.audiomegaphone.com/p-s-197.htm16 Watts Output
NSN 5830-01-043-2413 (appears to be outdated / cancelled; crosses to a different NIIN)
Range: 1200 Yards / 1098 Meters
Color: U. S. Navy Grey
Hand-held pistol-grip trigger unit with volume control. Used by Military, Navy and maritime industries. Built to Federal Specifications.
S-168MA Aircraft Hailer
16 Watts Output
http://www.audiomegaphone.com/p-s-168ma.htmApproved for commercial aircraft emergency equipment. Has all features described for Model S-168M plus battery test pin jacks for instant measuring of battery condition. Quick release mounting bracket, Model SS-11M, is used by commercial airlines throughout the world.
NSN 5830-00-856-6835 (appears to be outdated / cancelled; crosses to a different NIIN)
Range: 1200 Yards / 1098 Meters
Color: Two-Tone Blue and International Orange