Amazon.com : Loudmore Professional 15" Large Megaphone Bullhorn with Detachable Microphone, USB/SD/MMC Reader, AUX Input, Recording and Siren - Perfect for Indoor/Outdoor Sporting Events and Crowd Control (Black) : Sports & Outdoors
Pyle 40 Watt Professional Megaphone Clear Sound & Ergonomic Grip - Multi-Function with Talk, Siren, Volume Control - Detachable Handheld Mic - Indoor & Outdoor Sports, Emergency Response - Walmart.com
Amazon.com : Pyle 100-Watt Square Megaphone Bullhorn, Lightweight and Portable Loudspeaker Horn with Aux (3.5mm) Input for MP3/Music, Automatic Siren, Whistle, MIC/Talk (Black), 1500 Square Yards Projection Range : Sports & Outdoors
Amazon.com : UZI Loud Megaphone Bullhorn, Recording & Repeat Playback, Coach, Referee Megaphones, 50Watt, Portable Speaker, Real Siren, Adjustable Volume, Detachable, Outdoor Activities, Football, Baseball, Hockey : Pa Systems : Sports & Outdoors
TOA ER-2930W 45W Shoulder Megaphone With Whistle And Wireless Microphone Option, White Or Gray | Full Compass Systems