when trying to down load the instruction manual for the HEM 629 this site shows me a picture of the proper manual which has for buttons on the diagram but, when I go to load the instructions it gives me the instructions for a Hem 629 that only has three buttons,same model number but slightly different monitor. The model I have actually says Kruger in the spot where this one says Omron but every other detail is exactly the same as the one pictured here with four buttons