Around december 5th or 6th 2018 around 4pm i was on my sons balcony in reno nevada taking a moment to relax and look out at the city when i saw a silver octagon flying object with a bright white light come over the mountain range that is north of me. the object was very very large and zipped back and forth, up and down over the mountain range then it would shoot across the sky south east and hover over the city of reno and go up and down, right and left over and over for a few minutes. in all of the maneuvers and direction change the object never curved around like an airplane or a helicopter would do. the change of directions and altitude were very direct and sharp with out ever making a curve or loop motion. the object would zoom north over above the mountain range and maneuver then zoom south east over the city and maneuver again, it did this back and forth for about 10 minutes then it zoomed north and disappeared over the mountain range. during all of this the center light on the bottom would blink for a sequence series then stay solid bright, then blink again for a time then solid again for a while. it kept repeating the sequence over and over till it left.