Features: ~Automatic tuning frequency control ~start-up automatic low-voltage self-checking system ~With Overload Protection & buzzer ~Position detected ~Flexible pressure & adjustable cushion position Series Intelligent Model KWV0935 KWV1520 KWV2020 Output(w) 900 1500 2000 Frequency(KHz) 35 20 Line Source 220V 1P 10A Control Auto Tunning Overload Protect Overload Protect & Alarm Buzzer Air Cylinder 40Ф 63Ф 80Ф Workpiece Max.Height 200mm 360mm Generator Dimension 300L x 540W x 330mm H Machine Dimension 320L x 470W x 1140H 400L x 695W x 1220mm H Generator Weight 25kg Machine Weight 40kg 120kg Welding capacity 20x50 65x160 90x160mm