This handheld small voltage and current signal generator can be used in scientific research, laboratories, company factories, electrical maintenance, etc. Come and try. Feature: The voltage and current signal generator is the most commonly used electrical test instrument for electrical engineers and technicians during onsite installation, commissioning, overhaul and maintenance of electrical equipment. Pluggable terminal blocks, safe and convenient wiring. 4-digit high-definition digital tube, the display brightness is evenly adjustable (1-8 brightness). Aluminum knob cap, electroplating button, high-quality film, charging indicator, battery switch. Three power supply methods: external power supply, DC5V micro USB, built-in lithium battery (only when type 1 is selected, the built-in lithium battery charging mode can be used). As long as you work all the way, you can also connect 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 mobile power, charger, computer USB port, etc. On the normal operation screen, save a voltage and current value, click the encoder to save, and after releasing the "OK" button, the screen displays "...", indicating that the save is successful. After restarting, the saved value will be displayed directly, and there is no need to adjust the parameters every time when starting up, which is very practical. Easy to carry and small in size, it is the best choice for on-site debugging. Specification: Material: ABS Colour: black Voltage output: 12V Current output: 0-24mA Type: 1-2 (optional) Charging method: built-in lithium battery (only type 1), external power supply, DC5V micro USB Battery: 1*Lithium battery, 3.7V, 1100mAh (only type 1 included) Size: about 89*69*28mm/3.5*2.7*1.1in Packing size: about 90*70*38mm/3.5*2.8*1.5in Weight: Type 1: about 95g/3.4oz Type 2: about 115g/4.1oz Packing List: (optional) Type 1: 1 * Voltage and Current Generator (not including battery) Either Type 2: 1 * Voltage and Current Generator (including battery)