This type of Bluetooth speaker can't be connected to two devices simultaneously. Automatic conversion between the music function and the TF card function.   Product Features :  Built-in voice prompt function. Suit for Android and ISO system, but the power display function, which supports iOS (Apple) system. Fashionable appearance design, the speaker is made of the silicone material. It is a solid, compact bit of kit! The sound is superb from such a tiny speaker system. The unit is so compact that it is easily transported. Support Bluetooth mode / AUX mode / TF card mode. External AUX for audio playback, compatible with mobile phones, Walkman, tablet phone, computers, etc Small-sized, with a safety hook, more convenient to carry.