SHYH SING ENTERPRISE CO., LTD. is the company which specializes in R&D. manufacture, production and sale of personal defense and police security system products, including multi-functional stun gun, metal detector, multi-alarm, pepper sprayer, multi-functional sprayer, reflective vest, flash baton, extendable baton, anti-riot flash, bullet proof vest, the shield with stun, bulletproof & anti-riot, handcuff, and anti-theft monitor, personal securi