This handheld small voltage and current singal generator can be used to scientific research, laboratories, corporate factories, electoric maintenance and so on, come on and try it. Features: This voltage and current singal generator is the most commonly used electrical test instrument for electrical and technical personnel during the installation, debugging, overhaul and maintenance of electrical equipment on site. Pluggable terminal blocks, safe and convenient wiring. 4-digit 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(only if you choose type 1 can you have bulit-in lithium battery charging mode). 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. MicroUSB 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 best choice for on-site debugging. Specifications: Material: ABS Color: black Voltage output: 0-10V Current Output: 0-22mA Type:1-2 (optional) Charging method: bulit-in lithium battery(only type 1), external power supply, DC5V micro USB Battery: 1 * lithium battery, 3.7V, 1100mAh (only type 1 included) Item size: 89 * 69 * 28mm / 3.5 * 2.7 * 1.1in Package size: 90 * 70 * 38mm / 3.5 * 2.8 * 1.5in Package weight: Type 1: 115g / 4.1ounce Type 2: 95g / 3.4ounce Packing List: (optional) Type 1: 1 * Voltage Current Generator(battery include) or Type 2: 1 * Voltage Current Generator(battery not included)