APP: IOS Find my APP Connectivity: Bluetooth 5.1 Speaker: Built-in Speaker Battery: User-replaceable CR2032 coin cell battery. Accessibility: Record lost location, Rename Item, Customize item . Keep tracking and find your items alongside friends and devices in the Find My app (only IOS). Simple one-tap setup instantly connects Tag with your Phone or Pad (not for android). Play a sound on the built-in speaker to help find your things. Finding locator leads you right to your nearby the tracking Tag. Find items further away with the help of hundreds of millions in the Find My network. Put smart tag into Lost Mode to be automatically notified when it's detected in the Find My network. All communication with the Find My network is anonymous and encrypted for privacy, Location data and history are never stored on Tag. Replaceable battery lasts over a year. Use APP: IOS Find My (IOS14.5 or later) Battery: Built-in battery(Replaceable) Wireless: Bluetooth 5.1 Size: 33x33x10 mm Color: Black Material: ABS Package Contents: 1 * GPS Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.