Description: Wide application: This key is a good fit for your keys, phones, handbags, wallets, pets, and many other things. User-friendly: This wireless device will make a loud alarm when the object is out of range, and it also records the location where it connected last time. Call phone: When connecting to a phone, you can use this bluetooth-compatible to find your phone by pressing the button twice, then the phone will make an alarm sound. Bluetooth-compatible 5.2: This wireless key is stable and fast, and the indoor range is about 5 to 20m, and the outdoor range is about 20-40m. Useful tool: This wireless device makes you can use a phone app to easily track and find your object. The more circles that are displayed on the phone APP, the closer you're to the object. Specification: Battery capacity: 240mAh. Wireless range: Approx. 40m/131.23ft(Open field). Size(LxWxH): Approx. 35x35x8.3cm/1.38x1.38x0.33 inch. Material: ABS. Battery: CR2032(Included). Volume: 90dB. Standby time: No connection: 560 days, connected: 180 days. Bluetooth-compatible frequency: 2.4Ghz. Bluetooth-compatible version: 5.2. Working voltage: DC 3V. Using temperature: -10 to 70℃. Standby current: <40uA. Alarm current: <12mA. Low battery detection: Yes. Color: Show as picture. Suitable OS: Intended for iOS, intended for Android. Note: There might be a bit of color distortions due to different computer resolutions. There might be a slight error due to different hand measurements. Package Includes: 1 Piece Tracker(with 1 Piece User Manual).