brand new and high quality Features: 1.44 inch LCD high-definition liquid crystal display, multi-directional viewing angle conversion, 160 degree wide viewing angle, high brightness, long working life. No matter which angle you are, you can enjoy the colorful display. The product integrates two sets of systems and switches the system through hardware switches, which is convenient and quick: USB tester system; USB input voltage is equal to output voltage. USB power system PER; high-precision CNC USB lifting power supply / constant voltage and constant current. Theme colors can be freely matched. You can choose 64 theme colors. The screen supports four directions of rotation to meet the Perfect viewing angle of the screen parameters when working in different directions USB power system applications: 1. Used as a common buck-boost power supply with over-voltage / over-current / over-power / over-temperature / under-voltage for protection. 2. This product has a constant current function, which can charge various small rechargeable batteries within 0.6V-30V within 10-20W; Charging steps: (1) Determine the float charge voltage and charge current of your rechargeable battery; (If the lithium battery parameter is 3.7V / 2200mAh, then the float charge voltage is 4.2V. If it is a 12V rechargeable battery, generally set the float charge voltage to Around 14V) (2) Under no-load conditions, set the output voltage to a floating charge voltage; (if charging a 3.7V lithium battery, adjust the output voltage to 4.2V) (3) Set the charging current (constant current value), just set the current directly. Note: When setting the current, you need to calculate the power, charge it within the power range, and use it at super power, the product will enter the for protection state. (4) Connect the battery to charge. 3. This product has a constant current function, which can directly drive 0.6-30V, 0-15W LED lights; Steps to drive LED lights: (1) Determine the working current and maximum working voltage you need to drive the LED; (2) Under no-load conditions, set the voltage value and current value so that the output voltage reaches the maximum LED operating voltage and operating current (Note: When calculating the power when setting the current, you need to charge within the power range. If the power is used at excessive power, the product will enter for Protection status.) (3) Connect the LED and test the machine. This product can achieve stepless dimming and flicker-free LED by adjusting the constant current value (between 0-working current)! Charging Tester only,other accessories demo in the picture is not included. Specification: System parameters of USB tester specification: Measuresd voltage: 3-24.00V Measuring current: 0-5.000A Capacity measurement range: 0-99.999Ah Energy measurement range: 0-99.999Wh Temperatures measurement range: -10C-100C Data refresh rate: 4HZ(250MS) Power system(PER)parameters specification: Input voltage: 3.5V-24V Ourput current: 0.000A-2.000A Outout power: 20w Data refresh rate: 4HZ(250MS) Material: ABS Size: app.8.6x3.7cm/3.39x1.46in Color: As the pictures shown Quantity: 1 Pc Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 x Charging Tester