Businesspro Mall M5Stack Mini GPS/BDS Unit (AT6558) (行貨1年保養) This is the M5Unit version of GPS, integrates a Zhongke Weibeidou navigation chip AT6558 and a amplification chip MAX2659 used for amplifying antenna signal. A Product #: businesspro-M5Stack Mini GPS/BDS Unit (AT6558) (行貨1年保養) Regular price: $HKD$108.0 Available from: Businesspro MallIn stock