Microprocessor control,digital display, operated by touch panel for easier visibility and access. DC/AC brushless frequency conversion motor (by user’s choice), without carbon dust pollution, and various kinds of rotors for convenient use.â—†Electronic door interlock for safe operation.â—†Fast Acc and Dec, the fastest Acc time is 30s, the shortest Dec time is 28s. you can set different Acc and Dec time.â—† RCF value can be calculated automatically. And self-balance.TECHNICAL PARAMETER:Model HL-550Max speed 4200r/minMax RCF 3550×gMax capacity 1600ml (4×400ml)Time range 0~99min (LED)1S~99min59S (LCD)The fastest time of Acc/Dec 30/28sSpeed accuracy ±30r/minPower supply Ac220V 50Hz 6ANoise <65dB(A)Dimension 470×560×380mm (L×W×H)