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DSD TECH HM-10 Bluetooth 4.0 BLE iBeacon UART Module with 4PIN Base Board for Arduino UNO R3 Mega 2560 NanoThis is a Bluetooth 4.0 module with 4pin base board that can support iphone4s or later. But does not support the version is lower than the android 4.3 phone(it dont support classic bluetooth 2.0 spp features) The core module is HM-10 Base boa..