Product Description ?Product Specification? Ultrasonic Vibration Frequency: 40KHz Product Dimensions (Unit: inches): 1.02 * 0.91 * 7.17 Weight: 4.23 ounces (excluding power cord) Maximum Output Power: 30W Rated Voltage: DC 12V / 15V Fast Charging Power Delivery: PD, QC (12V - Normal / 15V - High) Operating Environment: 5 - 35, humidity 20% to 70% (non-condensing) ?Auto Stop Explanation? In the Normal Mode (indicated by a green light), the operation will automatically stop after approximately 5 minutes. You can restart by pressing the button again without cooling down time. In the High Mode (indicated by a yellow light), the operation will automatically stop after approximately 2 minutes. You can restart by clicking the button again (or long press) without cooling down time. ?Notes? Please note you will need an external charger or power bank with the following. Cannot cut materials that are harder than the blade, such as metal, glass, ceramics and marble. If forced to cut, the blade will be damaged. There is no limit to the continuous working time, the 5-minute automatic power-off function is for safety reasons.