how to set the timer on vida 900001

Indeed, sir. To set the timer on a Vida 900001, you will need to access the device's settings menu. Depending on the model, this can usually be done by pressing and holding the timer button until the display begins to flash or a setting mode is activated. Once in setting mode, use the arrows or number keys to adjust the desired time, typically hours and minutes, before confirming your selection. If I may venture to say, it's always wise to refer to the user manual for specific instructions, as some models might have slightly different procedures.