Multiple Display Modes: Simply press the small button to switch between voltage and current display modes. The 0-100% or 0-50Hz display can also be switched according to the instruction manual. Voltage Output: DC ±10V, accuracy 0.01V. Output voltage is adjusted by rotating the encoder knob and can be calibrated. Current Output: 0-22mA, accuracy 0.01mA. Output current is adjusted by rotating the encoder knob and can be calibrated. Power Supply: Can be powered via an external 5V micro USB interface or a 15-30V DC power supply. Both methods can operate the generator, and both can be connected simultaneously. (Battery not included) Battery Type: DC 3.7V 1000mAh 803040, Weight: 0.38139971326 Pounds, Manufacturer: Gishbjka