Features:As this is open source, for some detailed parts, it is not totally like the original one, we update it and delete some useless,but the usage is like original one, (if you care about our products is not totally like original one, pls do not place order) we test the board before we send to customers.Specifications:Scanning features: ScanningPrecision: 0.5 mmScanning time (configurable): 2-8 minSteps per rotation: 1600 maxScan volume: (Ø) 250 x (H) 205 mmMaximum supported weight: 3 kgPackage includes:1 x UNO R3 Module1 x Scan Controller1 x A4988 Stepper Driver1 x USB Cable