high quality Long Battery Life of Keychain: The battery of the keychain is rechargeable and can last for 4 months on a single charge, so there is no need to charge frequently and it is more convenient to use. High Quality Material: The heavy duty keychain ring is made of stainless steel material, which is fashionable, not bulky and easy to carry. The keychain finder has a built-in spring buckle that can be quickly clipped onto your belt or backpack. Works with Apple Find My: The keychains for men with a built-in tracker can be connected to the "Find My" app. Track and find men'keychains in the Apple Find My app so you will never lose your keychain. Useful function: Keys Tracker Play Sound Alert Left-Behind Remind Receive a lost notification. Note: Android devices are not supported. Mens Keychain with Tracker: Within Bluetooth range (approx. 160f/50m), simply use the Find My app to play sound and locate your keys. Meanwhile, you will be notified when your keys finder & tracker is forgotten and out of device range. This can effectively prevent you from forgetting or losing your keys. Compatibility of Find My App: The keychain tracker for men with a built-in tracker can be connected to the "Find My" app, which is only compatible with iOS system devices such as iPhone, iWatch, iPad, etc. Android devices are not supported. Smart Keychain for Men: 1*Carabiner Keychain1* Rechargeable type-c Cable1* Instruction Manual and a minimalist box. Keychain with finder is the most special gift for dads, uncles, brothers, friends and family on birthdays, anniversaries, Father's Day, Valentine's Day, Christmas and other special occasions.