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Criminals are often active at night.because of poor sight.It will rise the rate of crime.when people are in danger.because fright and stress,victim usually cannot yaling to ask for help.at this time was very dangerous.
This product is usually hung on the chest like a necklace.when you need it. pick up and talk it.It can enlarge the volume.can deter each other.
Shin Ting/ Ho
Changhua County, Taiwan
Pei yu / Chen
Hsinchu County, Taiwan
Sheng chun/ Wu