switches to reserve mode when the batteries are nearly spent. and after the mud is completely dry, just sand over it to smooth it out, and it’s done! get expert advice on binoculars and telescopes and try them out on our telescope deck. he helped me with my case when i got into an accident and i'm so glad i called him instead of just settling with the insurance company by myself. i came all the way up here to escape that bone biting cold for my health 35 years ago,and have never looked back at all!!!! 