Shenzhen Patrol Hawk Technology Co., Ltd is a professional GSM alarm system manufacturer, established in July of 2003, which is the first and the most professional GSM alarm supplier in China. Over the years, we have been specialized in designing, manufacturing and selling of GSM security alarm, having the core technology of independent intellectual property rights. We also had a professional R & D, production and sales team, who with years of experience, strength technology, high quality ...