arrive well packed, No batteries included, AAA bateries required.The difficulty was reading the instructions with a magnifying glass and determining which button does which. The first set of new batteries gave no response, they did say wait 10 minutes. I replaced the batteries from a different manufacturer. Eventually pressing the trigger got a response from the screen.ON switch/ use trigger, Top quad switch/ Backlight, Bottom Quad/ Sound, long press C/F temp, Left and Right Quad/ Log reading UP/Down. Use at 1-2" from forehead. The reading is logged at the next memory slot.