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Best sound quality
Built in. ------
USB
TF
SIREN
RECORDING
Lithium Battery
TF
unidirectional microphone
voice range 800 meter
Battery life-3-5 hour
working range DC,7.4--9v
Megaphone
Big Megaphone
megaphone for police
police megaphone
also available in 🎤🎶🎵
Vijay Electronics champa
@vijayelecph