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Built-in DSD TECH Bluetooth 4.0 BLE module, Supports iOS devices(iPhone and iPad) and Android 4.3 devices or later Support 5V and 12 power supply. Built-in 4-channel relay. The relay only outputs control signals and does not directly output power. It can control DC and AC circuits. 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.