Caution: color: we ship according to the color of the first picture, in the package: If the quantity is not stated in the description, we will ship the item according to the quantity and model in the title.If the title does not have a quantity, it is 1pcs. Handheld 0-10v/2-10v 0-20ma/4-20ma signal generator adjustable current voltage analog simulator signal sources output 24v the product is shipped based on the color or size of the main image of the product page. Working voltage:dc 15~27v /mirco-usb 5v 1. 1Ch analog output, optional voltage type output range 0/2-10v or current type output range 0/4-20ma 2. Voltage-type output load impedance requirements greater than equal 2kΩ, current-type output impedance requirements less than equal 500Ω 3. Voltage, current output, a key switch indicator description v red is bright, output is 0-10v voltage signal; Flashing, output is 2-10v voltage signal ma green is bright, output is 0-20ma current signal; Flashing, output is 4-20ma current signal size:8.5*5*2Cm material:plastic colour:blue package contents: 1 * 0-10v/2-10v 0-20ma/4-20ma signal generator adjustable current voltage analog simulator only the above package content, other products are not included. Note: light shooting 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.