The device worked fine initially. In a year or two it will be switched off by a happy coincidence. Then it stopped working completely. The button battery contact is made of very light metal and bent at a sharp 90 degree angle from the circuit board to the battery compartment. The metal was tired and failed at one of the bends, rendering the plane unusable. A truly unfortunate design flaw. I really don't think I got any value out of the product before it failed.
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