Instant purchase available. No price negotiations (comments will be ignored). This is a non-genuine AirTag compatible with Apple iPhone's Find My feature. Since it is non-genuine, select "Other supported items" when operating it on an iPhone. Please refer to the photos for size and included accessories. A ruler is not included. Not compatible with Android. Batteries are included. For inspection and operation confirmation, I have linked it once to check the function and have completely removed the device link. Please refrain from purchasing if you are concerned about this. It will be packaged with cushioning material and shipped via Mercari's anonymous shipping service, Packet Post Mini.