This type of Bluetooth speaker can't be connected to two devices simultaneously. Automatic conversion between the music function and the TF card function. The unit is so compact that it is easily transported, with a safety hook for extra convenience and support. Supports Bluetooth mode/AUX mode/TF card mode. External AUX for audio playback, compatible with mobile phones, Walkman, tablet phones, computers, etc. Features: Built-in voice prompt function Suitable for Android and IOS systems, but the power display function Fashionable appearance design, the speaker is made of silicone material It is a solid, compact bit of kit! The sound is superb from such a tiny speaker system Specifications: Dimensions: H:5.0 x W:7.0 x D:15.0 cm Colour: Silver Model Number: AQPOSSRE