1. Use high quality materials, 2. Compact size and exquisite appearance3. Easy to use4. High efficiency, reliable and stable performance5. Wide range of applicationsActive current output: 0-22mA (minimum output is about 0.1mA), load 0-550Passive current output: 0-22mA (minimum output is about 0.1mA), external power supply 15V-30V, load 0-550Voltage output: 0V-12V (minimum output is about 0.05V)24V output voltage: Drive current 35mA, do not use more than 35mABattery undervoltage prompt. When the undervoltage indicator lights up, please shut down and charge it in timeIf you do not use it for a long time, charge it at least once every 2 months to prevent battery damageMICRO-USB interface for power supply or chargingUse ring mirror: 0C-50 C without condensationDue to different factory batches, the product words are different, and the product accessories have slight differences in color and appearance, but it does not affect normal useColour:As ShownMaterial:Circuit board + plasticPackage Contents:1 x 4-20mA signal generatorOnly the above package content, other products are not included.Note: Light reflection 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.