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) 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. Multiple Display Modes: Simply 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. Battery Type: DC 3.7V 1000mAh 803040 Color: Black Material: ABS Package Contents: 1 * current/voltage signal generator 1 * charging cable 1 * screwdriver 12 * accessories. Only 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.