i have no idea if these work or not, i did not put new batteries in them or test them. i'm not sure if they have batteries/corrosion but can check upon request, I forget when doing the photos. this is two BLUE sets. see photos for what is included. 

nice condition, may have some minor marks/wear.

see pictures for details and measurements, message with questions.

This item is sold as-is with no guarantee or warranty. PLEASE look the pictures over carefully!

non smoking, pet free home. Thanks for looking!