PULSE MP50X - 25W Megaphone With Siren & Shoulder Strap - 
The MP50X from Pulse is a 25W handheld megaphone with detachable shoulder strap and a CB style anti-howl microphone with coiled lead.
Power rating: 25W
Projection range: Up to 500m depending on conditions
Siren on/off switch
Volume control
Microphone on/off switch with slide lock
Power supply: 8x1.5V D size batteries (not included) or 12VDC (car adaptor included)
Dimensions (ØxL): 230x345mm
Weight: 1.36kg (excl.batteries)