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Factory price , the reliable trustworthy and helpful service , the fastest delivery ! Five clicks for power on/off Three Clicks for voltage adjustable Two clicks for pre-heating Button led light indication: 2.6V green, 3.2V blue , 4.0V red light , Preheating Mix light Output short circuit protection, over- discharge protection, overcharge protection.Protection, overcorrect protection, internal wiring short circuit protection Color Black, stainless steel,white, green, red, pink, blue, purple 6 months Warranty,Buy with confidence Factory price