Datasheet: https://images-na.ssl-images-amazon.com/images/I/81CRdUi0xWL.pdf
The item provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device is not intended for automotive applications.
Output voltage proportional to AC or DC currents.
FR-4 fiber glass PCB, dual copper layers.
100% new, never used.

Electrical Parameters:
Load Maximum Current: +/-5Amp, +/-20Amp and +/-30Amp selectable.
Load Frequency Bandwidth: DC ~ 80 kHz.
Minimum Isolation Voltage: 2.1 kV(RMS).
Operating Voltage: Regulated 5VDC, or 8 ~ 35VDC.
Operating Current: 20mA(max).