Ultransmit Aroma VIVI Ultrasonic Aromatherapy Essential Oil Diffuser, High Capacity Diffuser with Auto Shut- Off (Red)

While this oil diffuser is gorgeous and looks like a piece if art in my living room, after 5 minutes I cannot smell the oil anymore. I've tried adding more but same thing - smells great for 5 minutes then nothing. Not sure why this is. I do like the different settings and it is easy to fill. Just seems like maybe it's a badly shaped reservoir?

its very nice looking and good quality and yet it doesn't have a timer, and also if you let it run for awhile the oils start to smell funky