Tri Tronics Sport Basic G3 collar.  Currently the collar does not charge in the base, it blinks red and probably needs to have the battery replaced. I tried to contact the manufacturer to inquire how much a new battery would cost but did not get a reply.  I do get a light on the handheld receiver after putting in new batteries. I'd prefer this go to someone who might be able to repair it and use it rather than me throw it in the trash.