The collar wont affect them at all, as they arent in direct contact with it. Hell cats and dogs have them on their necks no problems. But i dont see anyone putting them or rodents.
The red spider mites yes will bite, But most mites on rats/mice from bedding wont bite us. I have a wood mite problem from the bedding i buy, But when i treat with the bedding spray it kills them off well. Just need find something thats cheaper long run.