Sunnest Wireless Bluetooth 4.1 Audio Music Receiver Adapter with 3.5 mm Stereo Output and Hands Free Call for Most Smartphones, Tablets, Audio Player, Car or Home Audio Music Streaming Sound System. Build-in Microphone and Battery- The Bluetooth Receiver with Mic makes your phone call hands free and provides you high quality sound. Chargeable battery is built for continuous use. Great function and Compact Design- Answer/End/Reject/Redial calls, play/pause music, adjust volume. This 4.1 Bluetooth receiver is designed for portable use, very convenient for travel and daily use. Amazing Connection- The Bluetooth Receiver can connect two Bluetooth devices simultaneously and will connect to the previous connected phone automatically when Bluetooth function turns on. Wide Compatibility- Compatible with most smartphones and Bluetooth electronics through A2DP; ideal for home or vehicle audio systems using standard RCA or 3.5mm Jack. Package and Warranty- 1 pack Bluetooth audio receiver,1 pack Micro USB Cable, 1 pack 3.5mm Audio Cable, 1 Pack 3.5mm audio metal adapter and 1 paper user manual. 12 months worry-free product guarantee from Sunnest and Professional technical support. Efficient and always satisfying customer service.