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Built-in CC2541 Bluetooth 4.0 BLE module, supports iOS devices and Android 4.3 devices or later 2 Channel relay. Supports 5V and 12V operating voltages. Free APP for Android , please search "DSD TECH Bluetooth" in google play. Free APP for iOS devices(iPhone), please search "DSD TECH Bluetooth" in the APPStore. DSD TECH provides a one-year warranty on this Bluetooth Relay. If you have any questions, please feel free to contact us.