Fangrui Product Details Working Voltage: Dc 15~27v / Mirco Usb 5v 1.1 Channel Analog Output, Selectable Voltage Type (output Range 0 / 2-10v) Or Current Type (output Range 0 / 4-20ma) 2. Voltage Type Output Load Impedance Requirement 2komega, Current Type Output Impedance Requirement Le 500omega 3 Voltage, Current Output, One Button Switch 4. Size: 85 X 50 X 22mm Material: Plastic Color As Shown Indicator Description V (red) Is On, The Output Is 0-10v Voltage Signal; Flashing, Output Is 2-10v Voltage Signal Ma (green) Is On, Output 0-20ma Current Signal; Flashing, Output Is 4-20ma Current Signal Port Description: Pwr: Connect To Dc15-27v Positive Power Supply Gnd: Power And Signal Ground Gnd: Power And Signal Ground V0: Voltage Analog Output Interface Ma0: Current Output Analog Output Interface Package Contents: 1 X Signal Generator Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thin