The BT Interface for Cressi Dive-Watch Computers is an external docking station to send data to your smartphone via a Bluetooth connection. It uses infrared technology to gather data from the dive computer with minimal power consumption, while using a Bluetooth connection to link to a smartphone. It is compatible with both Android (OS Version 7.0 onwards) and iOS (OS version 10 onwards). The docking station is equipped with a CR 2032 battery that is included and replaceable by the user The Cressi app is available on both the Google Play Store and Apple App Store. Compatible with Cressi dive computer models: Cartesio, Goa, Neon, Nepto and King. The BT Interface is designed and manufactured in Italy by Cressi, an Italian brand pioneer in scuba diving, snorkeling and swimming equipment since 1946. The product is covered by a 2-year limited warranty.