[2-in-1 Voltage & Current Generator]--- Voltage Output: -10V~+10V, precision is 0.01V, current output: 0-22mA, precision is 0.01mA, rotate the encoder knob to adjust output voltage and current, switchable and adjustable, can be calibrated. Encoder knob rotate one circle has 20 pulses.[Multiple 4-Digit Display]--- With 4 different types of digit display, two decimal points, you can press "Mode" button to switch the display mode between voltage and current, you can also follow the instructions to switch 0-100 percent or 0-50HZ display.[Different Power Supply Modes]--- With 1000mAh 3.7V built-in rechargeable battery embedded inside (charged via micro-USB port), it can be powered via various ways, micro-USB-5V, external power DC 15-30V, each can make the signal generator to work.[Safe to Use]--- Output range: passive or active 0-22mA, -10~+10V, voltage output can be exactly 0.00V; output range and precision are programmable and adjustable. Output is with short circuit protection, power supply with reverse connection protection, which is safe for you to use. User can set 9 x fast signal output points, more convenient to do debugging.[Wide Application]--- It can be used for PLC and panel debugging, device testing, frequency converter, flow valve, servo motors speed regulation, light dimmer and ect. With small size design, it is easy and convenient for you to carry it.Colour:As shownMaterial:Metal + PlasticPackage Contents:1 set * servo motorOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.