Neck size: 18-32cm Collar color: Red Tracker (AirTag device) size: Height 1.25cm, Diameter 1.7cm, Weight 2.7g Operation confirmed. Please read the following description for details. The device is housed inside a trapezoidal tracker. I think it can also be used by replacing it with your existing collar. The price will not change even if you don't need the collar. In addition, a bell and spare battery are included. The bell is also removable, so please remove it if you don't need it. Although not Apple-certified, it is compatible with the iPhone "Find My" app. No other app downloads are required for use. The tracker alone can also be used for other purposes. --- ・Whether it can be registered with the iPhone Find My app ・Whether it detects the location I have confirmed the above operations. I only confirmed the tracker by physically moving it without using the collar. The pairing has been released, so it should work if you set it up according to the instructions in the manual after delivery. (The manual itself was a little creased from the beginning. Please understand.) The spare battery and protective tape are all put back and wrapped, so be sure to remove the protective tape according to the instructions and operate it. The manufacturer does not recommend Android, so this product is for iPhone users. -- Regarding the details of the settings, I cannot teach you how to use it here because it will be affected by the iOS version and the device settings. Please only purchase if you can understand the manual. Please check the full text photos of the basic operations. If you don't understand or are not confident, please refrain from purchasing. As a reminder, this product has been handled by people and its operation has been confirmed. Since the pairing has been released, I cannot track the location information from here. I will ship it in a state where you can re-register it on another device and use it immediately. Due to the nature of the product, please refrain from purchasing if you are overly concerned. -- We plan to ship using cushioning material and Yu-Packet Post Mini. The original box is also reasonably durable. If there is any damage during shipping, please be sure to contact the operator. After the transaction, please give us a rating after you have confirmed receipt. Lost item prevention tag