The plug-in terminal wiring is safe and convenient, and the display brightness is uniform and adjustable (level 1-8 brightness)External power supply, -SD and built-in lithium battery can work as long as one circuit, and can also be connected at the same time.USB universal interface -USB universal interface, which can be connected to charging treasure / charger / computer USB port, etc.Set a voltage and current value, click the encoder to save, restart and directly display the saved value, without adjusting the parameters every time you start up, which is highly practical.Hand held small signal source, easy to carry, sharp tool for on-site debuggingVoltage output: DC 12VCurrent Output: 0-24mAsize:89x69x28mmMaterial:ABScolour:blackPackage Contents:1 * voltage and current signal generator (without battery)Only the above package content, other products are not included.Note: Light 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.