Vtin Portable Wireless Bluetooth Receiver Car Kit Audio Adapter 3.5 mm Stereo Output for Home Audio Music Streaming Sound System Advanced Version: Bluetooth CSR4.0 Tech, 30 feet operation range with great performance: A2DP&AVRCP profiles provide high quality sound. Wide Compatibility: compatible with most smartphones and Bluetooth electronics. Double Link: connect two Bluetooth-enabled devices simultaneously; Freedom to enjoy wireless music or phone calls. Small but Powerfull: 8 hours working time; only need 1.5 hours to charge it fully. Sleek and Portable: 8mm in thickness. ideal for home or vehicle audio systems.