Features: External Power: External power supply of DC15V-30V can share 24V power supply of PLC and other equipment. Micro USB Interface: Micro USB universal interface, which can connect to charger, power bank, computer USB interface, etc. Rechargeable Battery: Built in 1100mAh 3.7V rechargeable battery.(only with battery type) Practical: Set a voltage and current value, click the encoder to save, and restart to directly display the saved value. There is no need to adjust parameters every time starting up, so it is highly practical. Easy Use: One-key switching of current and voltage, simultaneous output. Application: The 0-10V/0-22mA voltage and current source signal 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. It is also widely used in scientific research, teaching experiment and other fields. Design: 4-digit high-definition digital tube, the display brightness is uniform and adjustable (1-8 brightness). Wiring: Pluggable terminal blocks, safe and convenient wiring. 3 Power Supply: External Power Supply, micro USB, built-in lithium battery, as long as all the way to work, can also be connected at the same time. Three power supply methods, very comprehensive. Portable: The size is only 89 x 69 x 28mm/3.5 x 2.72 x 1.1inch(L x W x H), the sizeof the mouse is as big as it is, so it is convenient to carry it. Hand-held small signal source, Easy to carry the on-site debugging tool. Notes:Electronic user manual are available. Specifications: Item Type: Handheld Signal Generator Material:Plastic Color: Black Types: Without Battery, With Battery(built in) 3 Power Supply: External Power, Micro USB, Built in Rechargeable Battery Battery: 1100mAh 3.7V Rechargeable Battery(built in) Voltage Range: 0-10V Current Range: 0-22mA Size: About 89 x 69 x 28mm/3.5 x 2.72 x 1.1inch(L x W x H) Package Includes: 1Pc xHandheld Signal Generator Notes: Transition: 1cm=10mm=0.39inch 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement.