DICOCO Bluetooth 4.0 Wireless Anti lost Seeker Alarm Key Finder Self Timer for Smartphone (pink) Bluetooth 4.0 version with low power dissipation . Two-way anti lost, Find each other within range. The location function is extremely perfect for road nerds to exactly find their cars. Compact and lightweight, handy like a key ring, and you can pair up trackers simultaneously to a phone. This tracker should be used with iTracing, an app downloaded from App Store and pair it to your phone via Bluetooth.