4.1 BLUETOOTH CONNECTION supports multi-connection that allows for simultaneous use of the headphones with two mobile phones. Comes with the recently updated Bluetooth 4.1 with enhancements in coexistence, better high quality connections, and improved faster data transfer. Bluetooth 4.1 allows devices to reconnect automatically when they are in proximity of one another. These wireless headphones can connect with Bluetooth enabled music players & A2DP enabled devices such as iPad, iPhone, iPod touch, Android Smart Phones, tablets, etc. Fit for iPhone 6 6Plus 5S 5C 5 4S, Galaxy Note 3 2 S4 S3 and Google，Blackberry，LG other Smartphones.