Has anyone heard of a product that would make a noise when the battery is running low? I lost my P3P in a field with hip deep grass and could not find it. I watched the video feed on my phantom, but could not figure out where it was. If there was a buzzer, or chime that would activate when you hit 5%, it might be very helpful in tracking down lost crafts. It already makes a noise on power up, wouldn't it be easy to add that feature?