Specification: Model: KWS-MX19 Color: black, white (optional) Voltage: DC4V-30V (overvoltage protection can be set arbitrarily) Current: 0-5.5A (overcurrent protection can be set arbitrarily) Electricity: 0-9999mWh Capacity: 0-9999mAh Timing: 0-99 hours Timing: 0-24 hours Internal resistance: 0-999.99 ohms USB: output USB3.0 Power: 0-150W Product weight: 16g Product size: 69 * 56 * 25mm/2.72 * 2.2 * 0.98in Key operation instructions: 1. Setting instructions for timed shutdown: Long press the button for three seconds and the number on the screen will flash. Short press the button once again. Add a 30 minute delay to shut down. Press and hold the button for three seconds to confirm saving the parameters you have set. 2. Overvoltage protection setting instructions: Long press the button for three seconds and the number on the screen will flash. Short press the button once again. Apply a voltage of 0.5 volts. Press and hold the button for three seconds to confirm saving the parameters you have set. 3. Overcurrent protection setting instructions: Long press the button for three seconds and the number on the screen will flash. Short press the button once again. Add 0.5 amps. Press and hold the button for three seconds to confirm saving the parameters you have set. 4. Accumulated working time, power, and capacity: Pressing and holding the button for 3 seconds when returning to the main screen can clear the retained data. 5. Current and voltage calibration method: The standard voltage of 5.000V must be used to press and hold the button. After powering on, the button can be released when Factory Setting is displayed on the screen, and the product can be automatically calibrated. Attention: During calibration, the product cannot be connected to any load. Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement. Included: 1 x USB Tester 1. Accurate Measurement and Monitoring: The USB current voltage capacity power detector meter provides precise measurements and monitoring capabilities. Stay informed about the performance of your devices with accuracy. 2. Overvoltage and Overcurrent Protection: With adjustable overvoltage and overcurrent protection settings, this monitor ensures the safety of your devices by preventing excessive voltage or current flow. 3. Comprehensive Monitoring: Monitor various aspects of your device's performance, including voltage, current, energy capacity, etc. Stay informed and optimize your charging experience. 4. Setting Instructions for Timed Shutdown: Long press the button for three seconds and the number on the screen will flash. Short press the button once again. Add a 30 minute delay to shut down. Press and hold the button for three seconds to confirm saving the parameters you have set.