MiLi MiTag Smart Tag Android Version The top two have been used a few times. The bottom two are brand new, unused. The two that were used have some scratches on the back. The two used ones have been initialized. These are items that can be attached to valuables and linked with a smartphone app to prevent loss. Features like "location information" and "sound the alarm" allow you to find the tag's location. I haven't used them much and have kept them stored at home. Please consider purchasing only if you understand this.