... 3).Avoiding opening violencly. button activated auto lancet is a joint body of lancet and lancet device.It is very simple to operate ... is Humanity design.The button is vertical for the safety lancet body2:It will not use again once open it violencly3 ... 2.4mm1.8mm 1.8mmColor RedYellow BlueGreen button activated auto lancet(CE,ISO13485,CMDCAS,FDA,GMP)