Fangrui Product Details The Vibrator Has No Positive Or Negative Poles Power Board Parameters: 120w 40khz Uses High-quality Materials, Quality Is , Wide Application And Stable Performance Power Board Parameters: 120w 40khz Vibrator Parameters: 40khz Voltage: 220v Instructions For Wiring The Circuit Board And The Vibration Head (ceramic Transducer):1. The Circuit Board Must Not Be Powered On Without Load; It Must Not Be Powered On Without Cleaning Fluid During Cleaning; The Two Wiring Pieces Of The Vibration Head Are Divided Into Positive And Negative Poles And Must Not Be Connected In Reverse. 2. When Welding The Power Cord Of The Vibration Head, It Must Be Welded On The Side With Two Silver Layers, And The Other Side Is The Vibration Surface, Which Can Be Pasted Under The Cleaning Basin (this Is The Component Description Of The Purchased Ceramic Transducer). 3. The Silver Layer On The Ceramic Sheet Is Not Resistant To High Temperatures. When Welding The Power Cord, The Temperature Of The Soldering Iron Should Not Ex