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2G sim卡 种类 GPS跟踪器 质保服务 1 Years 原产地 Guangdong, China 品牌 Topin 型号 G21 用途 For cow/ cattle/ horse livestock tracking GSM Frequency GSM 850/900/1800/1900MHz Positioning methods GPS+AGPS+LBS+Wifi multiple positioning methods Collar length Adjustable 60-110cm Size 80*45*30mm ...