This voltage and current singal generator is the most commonly used electrical test instrument for electrical engineering and technical personnel during the installation, debugging, overhaul and maintenance of electrical equipment on site. Pluggable terminal blocks, safe and convenient wiring. 4-digit high definition digital tube, the display brightness is uniform and adjustable (1-8 brightness). Aluminum knob cap, electroplated buttons, high quality film, charging indicator, battery switch. Three power supply methods, external power supply, DC5V micro-USB, bulit-in lithium battery(with battery). As long as all the way to work, can also be connected at the same time. DC 15-30V external power supply, which can share the 24V power supply of PLC and other equipment. Micro-USB universal interface, can be connected to power bank, recharger, computer USB port and so on. In the normal operation screen, save a voltage and current value, cilck the encoder to save, after releasing the OK button ,the screen displays"...", which means the save is successful. Restart directly display the saved value, no need to adjust the parameters everytime when you turn on the machine, which is very practical. Easy to carry and small size, the for on-site debugging. Voltage output: 0-10V Current Output: 0-22mA Battery: 1 * lithium battery, 3.7V, 1100mAh Colour:black Material:plastic Package Contents: 1 x Voltage Current Generator(with battery) 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 thing. The measurement allowed error is +/- 1-3cm.