2.5V/7.5V/5V/10V Voltage Reference

A2. Features:

Built -in AD584kh, highest accuracy and stability
Same port can output reference voltage : 2.5v, 7.5v, 5v, 10v
The MCU switch 4-way reference voltage output with LED indicators
Single - button operation switch reference voltage,
Built - in lithium battery , easy to carry,can be charge by DC 5V,with charge indicator
4mm banana socket as output interface
"Please check input battery charging voltage and do not charge with more than 5.5 volts DC. Please charge with a USB adapter "