Key Features:Miniature size 42.3 x 42.3 x 16.5 mmIntegrally designed to fit onto motors seamlessly, as well as work standaloneAll-aluminum precision cast housing, sturdy and durable, good heat dissipationWide range input voltage0 - 4 A adjustable output currentmicrostep resolutions 1600Dual full H-bridge with PWM constant current controlSelf pulse generation, automatic run on power-upSpeed control through external potentiometer 0.75 - 1256 RPM0.3 seconds acceleration periodSwitch control run/stop, direction, enable/shutdownAutomatic current reduction / power savingElectrical Specifications:Output Peak Current: 0 - 4 AInput Voltage: 12 - 40 VDCPulse Input Frequency: 40HZ - 67 KHz, 0.75 - 1256RPM(for 1.8 deg motors)Isolation Resistance: More than 100 MDielectric strength: 500VAC for 1MIN.Operating Environment and other Specifications(Tj = 25/77):Cooling: Natural CoolingEnvironment: Avoid dust, oil fog and corrosive gasesHumidity: Less than 80% RHOperating Temperature: -40 - 85Vibration: 3G MaxStorage Temperature: -50 - 150Size: 42.3 x 42.3 x 16.5 mmWeight: 54.6 g(1.926oz)