Features 1、Hand held digital signal generator, supports 3 power supply modes, which is more convenient to use. 2、Voltage and current adjustments can be switched by one button, adopt independent wiring, and output can be simultaneously performed. 3、The output has short circuit protection, and power supply has reverse connection protection, which is safe and reliable. 4、With pluggable terminal blocks, it is easy to install, stable in performance and easy to carry around. 5、It supports two modes of coarse and fine adjustment, the number of adjustment turns can be set, simple operation. 6、Equipped with 4‑digit highlight digital tube, supports high‑precision adjustment, and the output can be calibrated. Specification Condition: 100% Brand New Material: ABS 3 Power Supply Methods: Charging with mobile phone charger, power bank or external 24V power supply External Power Supply: DC15-30V, Power: 1W (Not Charging)/4W (Charging) Lithium Battery Capacity: 1000mAh, 3.7V Maximum Charging Current: 0.6A External: Micro USB- 5V, Current: 0.2A (Not Charging)/1A (Charging) Current Output: 0-22mA Adjustable, Accuracy After Calibration: 0.05mA, Current sampling resistance is not more than 500 ohms Digital Tube Display Digits: 4 digits, two decimal places Encoder: 20 pulses per turn of the knob Power Supply: Built-in Lithium battery 1000mAH Size: Approx. 100x60x25mm / 3.9x2.4x1.0in Package List 1 x Signal Generator 1 x USB Cable 4 x Clip 4 x Insulation Clip Cover 1 x Screwdriver 6 x Terminal 1 x Manual