1. CNC DC buck-boost power supply, supports constant voltage and constant current 2. Large screen display, supports full viewing angle 3. Built-in intelligent temperature control fan, automatic start and stop. (It automatically start when the temperature is 50 or the current is 1A) 4. Compatible with for 18-21V lithium batteries, with a range of applications and easy to carry (batteries are not included in the shipping list) Version:35W Protection mechanism: 1. Input protection against reverse connection 2. Output protection against backflow 3. Input undervoltage protection: 4.7-30V adjustable 4. Output overvoltage protection: 0-32V adjustable 5. Output overpower protection: 0-51W adjustable 6. Overtemperature protection 7. Expiration protection: 0-100H adjustable 8. Overcapacity protection: 0-9999AH adjustable 9. Overenergy protection: 0-9999WH adjustable Parameters: Input voltage: 5.0-30V Output voltage: 0.6-30V Output current: 0-4.0A Voltage accuracy: 0.5% Output power: 35W Current accuracy: 0.5% Voltage resolution: 0.01V Current resolution: 0.001A Conversion efficiency: about 88% Soft start: Yes Note:Lithium battery is not included in the delivery list. Colour:Black Material:ABS Package Contents: 1 x PPS100 35W CNC adjustable power supply 1 x test clips 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.