Variometer Flytec 3005 Power on confirmed. Ascent/descent sound confirmed. Purchased 30 years ago, used for 5 years. Used for approximately 10 hours. Last used in 2000, after which the batteries were removed and it was stored indoors. No instruction manual. I don't know how to use it as it hasn't been used for a long time. For those who want it, I will include an AEROTACT cover, but there is a signature on the back. (See photo) The appearance is not bad, but I would appreciate it if you could purchase it if you understand that it is a used item that has been stored for a long time.