Fangrui Product Details Fangrui Product Details This Product Uses Lt Lm399h As The Reference Component, Innovatively Uses Usb 5v Power Supply, And Adds Secondary Emi Filtering To Make The Power Supply Purer And Interference-free, Small In Size, Easy To Carry And Transfer, And The Boost Resistor And Op Amp Use High-quality Components With Small Temperature Drift. Handheld, Small Size, Light Weight Usb Type-c 5v 2a Power Supply, Can Be Powered By Mobile Phone Chargers And Power Banks 6.95v Basic Output Low Temperature Drift, Tcr: Less Than 0.5ppm/users Can Diy, Diyer Use Adr1399 (pin To Pin) As A Reference Element, The Performance Can Be Immediately Stronger Two Sets Of Voltage Output 6.95v And 10v Use: To Check The Accuracy Of The Dc Voltage Range Of The 6.5-digit Multimeter Parameters: Reference Element: Lt Lm399h Input Voltage: Dc 5v 2a Input Interface: Type-c Port Working Indicator: Green Light Warm-up Time: At Least 1 Hour Output Interface: 4mm Safety Banana Socket Temperature Drift Less Than 0.5ppm/6.95v); Less Than 1.2ppm/10v) Working Te