IdeaNext Bluetooth V4.1 Receiver A2DP Wireless Audio Adapter for Car Audio System, Home Audio Music Streaming Sound System Bluetooth 4.1: Bluetooth V4.1 Receiver is compatible with most of smart phones and Bluetooth devices. Enjoy music at your home or car audio system. Easy to Use: Pair with 2 phones at the same time and standby together. Once disconnected over 10 minutes will be auto powered off. Easy to Switch: Built in echo cancellation microphone. Music or call switching. Using only one button, you can easily switch between music and call. Long Play Life: Work time up to 8-14 hours, up to 200 hours on standby. IdeaNext always provide for our customers with the best product and service. Please enjoy your shopping time.